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sin^2(x)*cos^2(x)=-1 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
   2       2        
sin (x)*cos (x) = -1
$$\sin^{2}{\left(x \right)} \cos^{2}{\left(x \right)} = -1$$
Solución detallada
Tenemos la ecuación
$$\sin^{2}{\left(x \right)} \cos^{2}{\left(x \right)} = -1$$
cambiamos
$$\frac{1}{8} - \frac{\cos{\left(4 x \right)}}{8} = 0$$
$$\sin^{2}{\left(x \right)} \cos^{2}{\left(x \right)} = 0$$
Sustituimos
$$w = \cos{\left(x \right)}$$
Es la ecuación de la forma
a*w^2 + b*w + c = 0

La ecuación cuadrática puede ser resuelta
con la ayuda del discriminante.
Las raíces de la ecuación cuadrática:
$$w_{1} = \frac{\sqrt{D} - b}{2 a}$$
$$w_{2} = \frac{- \sqrt{D} - b}{2 a}$$
donde D = b^2 - 4*a*c es el discriminante.
Como
$$a = \sin^{2}{\left(x \right)}$$
$$b = 0$$
$$c = 0$$
, entonces
D = b^2 - 4 * a * c = 

(0)^2 - 4 * (sin(x)^2) * (0) = 0

Como D = 0 hay sólo una raíz.
w = -b/2a = -0/2/(sin(x)^2)

$$w_{1} = 0$$
hacemos cambio inverso
$$\cos{\left(x \right)} = w$$
Tenemos la ecuación
$$\cos{\left(x \right)} = w$$
es la ecuación trigonométrica más simple
Esta ecuación se reorganiza en
$$x = \pi n + \operatorname{acos}{\left(w \right)}$$
$$x = \pi n + \operatorname{acos}{\left(w \right)} - \pi$$
O
$$x = \pi n + \operatorname{acos}{\left(w \right)}$$
$$x = \pi n + \operatorname{acos}{\left(w \right)} - \pi$$
, donde n es cualquier número entero
sustituimos w:
$$x_{1} = \pi n + \operatorname{acos}{\left(w_{1} \right)}$$
$$x_{1} = \pi n + \operatorname{acos}{\left(0 \right)}$$
$$x_{1} = \pi n + \frac{\pi}{2}$$
$$x_{2} = \pi n + \operatorname{acos}{\left(w_{1} \right)} - \pi$$
$$x_{2} = \pi n - \pi + \operatorname{acos}{\left(0 \right)}$$
$$x_{2} = \pi n - \frac{\pi}{2}$$
Gráfica
Suma y producto de raíces [src]
suma
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                                                                                                                                                                                                                                                                                                                    |    | -I*atan|---------------| ||         |    | -I*atan|---------------| ||       |    | -I*atan|---------------| ||         |    | -I*atan|---------------| ||         |    | I*atan|---------------|||         |    | I*atan|---------------|||       |    | I*atan|---------------|||         |    | I*atan|---------------|||
                                                                                                                                                                                                                                                                                                                    |    |        |   ____________| ||         |    |        |   ____________| ||       |    |        |   ____________| ||         |    |        |   ____________| ||         |    |       |   ____________|||         |    |       |   ____________|||       |    |       |   ____________|||         |    |       |   ____________|||
                                                                                                                                                                                                                                                                                                                    |    |        |  /        ___ | ||         |    |        |  /        ___ | ||       |    |        |  /        ___ | ||         |    |        |  /        ___ | ||         |    |       |  /        ___ |||         |    |       |  /        ___ |||       |    |       |  /        ___ |||         |    |       |  /        ___ |||
    /     /    ______________________________\\         /     /    ______________________________\\         /     /    ______________________________\\         /     /    ______________________________\\            /    ______________________________\            /    ______________________________\         |    |        \\/  -2 + \/ 5  / ||         |    |        \\/  -2 + \/ 5  / ||       |    |        \\/  -2 + \/ 5  / ||         |    |        \\/  -2 + \/ 5  / ||         |    |       \\/  -2 + \/ 5  /||         |    |       \\/  -2 + \/ 5  /||       |    |       \\/  -2 + \/ 5  /||         |    |       \\/  -2 + \/ 5  /||
    |     |   /                  ___________ ||         |     |   /                  ___________ ||         |     |   /                  ___________ ||         |     |   /                  ___________ ||            |   /                  ___________ |            |   /                  ___________ |         |    | -------------------------||         |    | -------------------------||       |    | -------------------------||         |    | -------------------------||         |    | -----------------------||         |    | -----------------------||       |    | -----------------------||         |    | -----------------------||
    |     |  /        ___       /       ___  ||         |     |  /        ___       /       ___  ||         |     |  /        ___       /       ___  ||         |     |  /        ___       /       ___  ||            |  /        ___       /       ___  |            |  /        ___       /       ___  |         |    |             2            ||         |    |             2            ||       |    |             2            ||         |    |             2            ||         |    |            2           ||         |    |            2           ||       |    |            2           ||         |    |            2           ||
2*im\atanh\\/   2 + \/ 5  + 2*\/  2 + \/ 5   // - 2*I*re\atanh\\/   2 + \/ 5  + 2*\/  2 + \/ 5   // + - 2*im\atanh\\/   2 + \/ 5  + 2*\/  2 + \/ 5   // + 2*I*re\atanh\\/   2 + \/ 5  + 2*\/  2 + \/ 5   // - 2*I*atanh\\/   2 + \/ 5  - 2*\/  2 + \/ 5   / + 2*I*atanh\\/   2 + \/ 5  - 2*\/  2 + \/ 5   / + - 2*re\atan\e                         // - 2*I*im\atan\e                         // + 2*re\atan\e                         // + 2*I*im\atan\e                         // + - 2*re\atan\e                       // - 2*I*im\atan\e                       // + 2*re\atan\e                       // + 2*I*im\atan\e                       //
$$\left(\left(\left(2 \operatorname{re}{\left(\operatorname{atan}{\left(e^{- \frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)} + 2 i \operatorname{im}{\left(\operatorname{atan}{\left(e^{- \frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)}\right) + \left(\left(\left(- 2 i \operatorname{atanh}{\left(\sqrt{- 2 \sqrt{2 + \sqrt{5}} + 2 + \sqrt{5}} \right)} + \left(\left(2 \operatorname{im}{\left(\operatorname{atanh}{\left(\sqrt{2 + \sqrt{5} + 2 \sqrt{2 + \sqrt{5}}} \right)}\right)} - 2 i \operatorname{re}{\left(\operatorname{atanh}{\left(\sqrt{2 + \sqrt{5} + 2 \sqrt{2 + \sqrt{5}}} \right)}\right)}\right) + \left(- 2 \operatorname{im}{\left(\operatorname{atanh}{\left(\sqrt{2 + \sqrt{5} + 2 \sqrt{2 + \sqrt{5}}} \right)}\right)} + 2 i \operatorname{re}{\left(\operatorname{atanh}{\left(\sqrt{2 + \sqrt{5} + 2 \sqrt{2 + \sqrt{5}}} \right)}\right)}\right)\right)\right) + 2 i \operatorname{atanh}{\left(\sqrt{- 2 \sqrt{2 + \sqrt{5}} + 2 + \sqrt{5}} \right)}\right) + \left(- 2 \operatorname{re}{\left(\operatorname{atan}{\left(e^{- \frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)} - 2 i \operatorname{im}{\left(\operatorname{atan}{\left(e^{- \frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)}\right)\right)\right) + \left(- 2 \operatorname{re}{\left(\operatorname{atan}{\left(e^{\frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)} - 2 i \operatorname{im}{\left(\operatorname{atan}{\left(e^{\frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)}\right)\right) + \left(2 \operatorname{re}{\left(\operatorname{atan}{\left(e^{\frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)} + 2 i \operatorname{im}{\left(\operatorname{atan}{\left(e^{\frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)}\right)$$
=
0
$$0$$
producto
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                                                                                                                                                                                                                                                                                                           |      |    | -I*atan|---------------| ||         |    | -I*atan|---------------| ||| |    |    | -I*atan|---------------| ||         |    | -I*atan|---------------| ||| |      |    | I*atan|---------------|||         |    | I*atan|---------------|||| |    |    | I*atan|---------------|||         |    | I*atan|---------------||||
                                                                                                                                                                                                                                                                                                           |      |    |        |   ____________| ||         |    |        |   ____________| ||| |    |    |        |   ____________| ||         |    |        |   ____________| ||| |      |    |       |   ____________|||         |    |       |   ____________|||| |    |    |       |   ____________|||         |    |       |   ____________||||
                                                                                                                                                                                                                                                                                                           |      |    |        |  /        ___ | ||         |    |        |  /        ___ | ||| |    |    |        |  /        ___ | ||         |    |        |  /        ___ | ||| |      |    |       |  /        ___ |||         |    |       |  /        ___ |||| |    |    |       |  /        ___ |||         |    |       |  /        ___ ||||
/    /     /    ______________________________\\         /     /    ______________________________\\\ /      /     /    ______________________________\\         /     /    ______________________________\\\           /    ______________________________\          /    ______________________________\ |      |    |        \\/  -2 + \/ 5  / ||         |    |        \\/  -2 + \/ 5  / ||| |    |    |        \\/  -2 + \/ 5  / ||         |    |        \\/  -2 + \/ 5  / ||| |      |    |       \\/  -2 + \/ 5  /||         |    |       \\/  -2 + \/ 5  /||| |    |    |       \\/  -2 + \/ 5  /||         |    |       \\/  -2 + \/ 5  /|||
|    |     |   /                  ___________ ||         |     |   /                  ___________ ||| |      |     |   /                  ___________ ||         |     |   /                  ___________ |||           |   /                  ___________ |          |   /                  ___________ | |      |    | -------------------------||         |    | -------------------------||| |    |    | -------------------------||         |    | -------------------------||| |      |    | -----------------------||         |    | -----------------------||| |    |    | -----------------------||         |    | -----------------------|||
|    |     |  /        ___       /       ___  ||         |     |  /        ___       /       ___  ||| |      |     |  /        ___       /       ___  ||         |     |  /        ___       /       ___  |||           |  /        ___       /       ___  |          |  /        ___       /       ___  | |      |    |             2            ||         |    |             2            ||| |    |    |             2            ||         |    |             2            ||| |      |    |            2           ||         |    |            2           ||| |    |    |            2           ||         |    |            2           |||
\2*im\atanh\\/   2 + \/ 5  + 2*\/  2 + \/ 5   // - 2*I*re\atanh\\/   2 + \/ 5  + 2*\/  2 + \/ 5   ///*\- 2*im\atanh\\/   2 + \/ 5  + 2*\/  2 + \/ 5   // + 2*I*re\atanh\\/   2 + \/ 5  + 2*\/  2 + \/ 5   ///*-2*I*atanh\\/   2 + \/ 5  - 2*\/  2 + \/ 5   /*2*I*atanh\\/   2 + \/ 5  - 2*\/  2 + \/ 5   /*\- 2*re\atan\e                         // - 2*I*im\atan\e                         ///*\2*re\atan\e                         // + 2*I*im\atan\e                         ///*\- 2*re\atan\e                       // - 2*I*im\atan\e                       ///*\2*re\atan\e                       // + 2*I*im\atan\e                       ///
$$2 i \operatorname{atanh}{\left(\sqrt{- 2 \sqrt{2 + \sqrt{5}} + 2 + \sqrt{5}} \right)} - 2 i \operatorname{atanh}{\left(\sqrt{- 2 \sqrt{2 + \sqrt{5}} + 2 + \sqrt{5}} \right)} \left(- 2 \operatorname{im}{\left(\operatorname{atanh}{\left(\sqrt{2 + \sqrt{5} + 2 \sqrt{2 + \sqrt{5}}} \right)}\right)} + 2 i \operatorname{re}{\left(\operatorname{atanh}{\left(\sqrt{2 + \sqrt{5} + 2 \sqrt{2 + \sqrt{5}}} \right)}\right)}\right) \left(2 \operatorname{im}{\left(\operatorname{atanh}{\left(\sqrt{2 + \sqrt{5} + 2 \sqrt{2 + \sqrt{5}}} \right)}\right)} - 2 i \operatorname{re}{\left(\operatorname{atanh}{\left(\sqrt{2 + \sqrt{5} + 2 \sqrt{2 + \sqrt{5}}} \right)}\right)}\right) \left(- 2 \operatorname{re}{\left(\operatorname{atan}{\left(e^{- \frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)} - 2 i \operatorname{im}{\left(\operatorname{atan}{\left(e^{- \frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)}\right) \left(2 \operatorname{re}{\left(\operatorname{atan}{\left(e^{- \frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)} + 2 i \operatorname{im}{\left(\operatorname{atan}{\left(e^{- \frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)}\right) \left(- 2 \operatorname{re}{\left(\operatorname{atan}{\left(e^{\frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)} - 2 i \operatorname{im}{\left(\operatorname{atan}{\left(e^{\frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)}\right) \left(2 \operatorname{re}{\left(\operatorname{atan}{\left(e^{\frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)} + 2 i \operatorname{im}{\left(\operatorname{atan}{\left(e^{\frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)}\right)$$
=
                                                                                2                                                                                2                                                                                                                                                
     /    /    /       /       2       \\\     /    /       /       2       \\\\  /    /    /        /       2       \ \\     /    /        /       2       \ \\\                                                                                                                                                 
     |    |    | I*atan|---------------|||     |    | I*atan|---------------||||  |    |    | -I*atan|---------------| ||     |    | -I*atan|---------------| |||                                                                                                                                                 
     |    |    |       |   ____________|||     |    |       |   ____________||||  |    |    |        |   ____________| ||     |    |        |   ____________| |||                                                                                                                                                 
     |    |    |       |  /        ___ |||     |    |       |  /        ___ ||||  |    |    |        |  /        ___ | ||     |    |        |  /        ___ | |||                                                                                                     2                                           
     |    |    |       \\/  -2 + \/ 5  /||     |    |       \\/  -2 + \/ 5  /|||  |    |    |        \\/  -2 + \/ 5  / ||     |    |        \\/  -2 + \/ 5  / |||  /      /     /    ______________________________\\     /     /    ______________________________\\\        /    ______________________________\
     |    |    | -----------------------||     |    | -----------------------|||  |    |    | -------------------------||     |    | -------------------------|||  |      |     |   /                  ___________ ||     |     |   /                  ___________ |||        |   /                  ___________ |
     |    |    |            2           ||     |    |            2           |||  |    |    |             2            ||     |    |             2            |||  |      |     |  /        ___       /       ___  ||     |     |  /        ___       /       ___  |||       2|  /        ___       /       ___  |
-256*\I*im\atan\e                       // + re\atan\e                       /// *\I*im\atan\e                         // + re\atan\e                         /// *\- I*re\atanh\\/   2 + \/ 5  + 2*\/  2 + \/ 5   // + im\atanh\\/   2 + \/ 5  + 2*\/  2 + \/ 5   /// *atanh \\/   2 + \/ 5  - 2*\/  2 + \/ 5   /
$$- 256 \left(\operatorname{re}{\left(\operatorname{atan}{\left(e^{- \frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)} + i \operatorname{im}{\left(\operatorname{atan}{\left(e^{- \frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)}\right)^{2} \left(\operatorname{re}{\left(\operatorname{atan}{\left(e^{\frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)} + i \operatorname{im}{\left(\operatorname{atan}{\left(e^{\frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)}\right)^{2} \left(\operatorname{im}{\left(\operatorname{atanh}{\left(\sqrt{2 + \sqrt{5} + 2 \sqrt{2 + \sqrt{5}}} \right)}\right)} - i \operatorname{re}{\left(\operatorname{atanh}{\left(\sqrt{2 + \sqrt{5} + 2 \sqrt{2 + \sqrt{5}}} \right)}\right)}\right)^{2} \operatorname{atanh}^{2}{\left(\sqrt{- 2 \sqrt{2 + \sqrt{5}} + 2 + \sqrt{5}} \right)}$$
-256*(i*im(atan(exp(i*atan(2/sqrt(-2 + sqrt(5)))/2))) + re(atan(exp(i*atan(2/sqrt(-2 + sqrt(5)))/2))))^2*(i*im(atan(exp(-i*atan(2/sqrt(-2 + sqrt(5)))/2))) + re(atan(exp(-i*atan(2/sqrt(-2 + sqrt(5)))/2))))^2*(-i*re(atanh(sqrt(2 + sqrt(5) + 2*sqrt(2 + sqrt(5))))) + im(atanh(sqrt(2 + sqrt(5) + 2*sqrt(2 + sqrt(5))))))^2*atanh(sqrt(2 + sqrt(5) - 2*sqrt(2 + sqrt(5))))^2
Respuesta rápida [src]
         /     /    ______________________________\\         /     /    ______________________________\\
         |     |   /                  ___________ ||         |     |   /                  ___________ ||
         |     |  /        ___       /       ___  ||         |     |  /        ___       /       ___  ||
x1 = 2*im\atanh\\/   2 + \/ 5  + 2*\/  2 + \/ 5   // - 2*I*re\atanh\\/   2 + \/ 5  + 2*\/  2 + \/ 5   //
$$x_{1} = 2 \operatorname{im}{\left(\operatorname{atanh}{\left(\sqrt{2 + \sqrt{5} + 2 \sqrt{2 + \sqrt{5}}} \right)}\right)} - 2 i \operatorname{re}{\left(\operatorname{atanh}{\left(\sqrt{2 + \sqrt{5} + 2 \sqrt{2 + \sqrt{5}}} \right)}\right)}$$
           /     /    ______________________________\\         /     /    ______________________________\\
           |     |   /                  ___________ ||         |     |   /                  ___________ ||
           |     |  /        ___       /       ___  ||         |     |  /        ___       /       ___  ||
x2 = - 2*im\atanh\\/   2 + \/ 5  + 2*\/  2 + \/ 5   // + 2*I*re\atanh\\/   2 + \/ 5  + 2*\/  2 + \/ 5   //
$$x_{2} = - 2 \operatorname{im}{\left(\operatorname{atanh}{\left(\sqrt{2 + \sqrt{5} + 2 \sqrt{2 + \sqrt{5}}} \right)}\right)} + 2 i \operatorname{re}{\left(\operatorname{atanh}{\left(\sqrt{2 + \sqrt{5} + 2 \sqrt{2 + \sqrt{5}}} \right)}\right)}$$
               /    ______________________________\
               |   /                  ___________ |
               |  /        ___       /       ___  |
x3 = -2*I*atanh\\/   2 + \/ 5  - 2*\/  2 + \/ 5   /
$$x_{3} = - 2 i \operatorname{atanh}{\left(\sqrt{- 2 \sqrt{2 + \sqrt{5}} + 2 + \sqrt{5}} \right)}$$
              /    ______________________________\
              |   /                  ___________ |
              |  /        ___       /       ___  |
x4 = 2*I*atanh\\/   2 + \/ 5  - 2*\/  2 + \/ 5   /
$$x_{4} = 2 i \operatorname{atanh}{\left(\sqrt{- 2 \sqrt{2 + \sqrt{5}} + 2 + \sqrt{5}} \right)}$$
           /    /        /       2       \ \\         /    /        /       2       \ \\
           |    | -I*atan|---------------| ||         |    | -I*atan|---------------| ||
           |    |        |   ____________| ||         |    |        |   ____________| ||
           |    |        |  /        ___ | ||         |    |        |  /        ___ | ||
           |    |        \\/  -2 + \/ 5  / ||         |    |        \\/  -2 + \/ 5  / ||
           |    | -------------------------||         |    | -------------------------||
           |    |             2            ||         |    |             2            ||
x5 = - 2*re\atan\e                         // - 2*I*im\atan\e                         //
$$x_{5} = - 2 \operatorname{re}{\left(\operatorname{atan}{\left(e^{- \frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)} - 2 i \operatorname{im}{\left(\operatorname{atan}{\left(e^{- \frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)}$$
         /    /        /       2       \ \\         /    /        /       2       \ \\
         |    | -I*atan|---------------| ||         |    | -I*atan|---------------| ||
         |    |        |   ____________| ||         |    |        |   ____________| ||
         |    |        |  /        ___ | ||         |    |        |  /        ___ | ||
         |    |        \\/  -2 + \/ 5  / ||         |    |        \\/  -2 + \/ 5  / ||
         |    | -------------------------||         |    | -------------------------||
         |    |             2            ||         |    |             2            ||
x6 = 2*re\atan\e                         // + 2*I*im\atan\e                         //
$$x_{6} = 2 \operatorname{re}{\left(\operatorname{atan}{\left(e^{- \frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)} + 2 i \operatorname{im}{\left(\operatorname{atan}{\left(e^{- \frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)}$$
           /    /       /       2       \\\         /    /       /       2       \\\
           |    | I*atan|---------------|||         |    | I*atan|---------------|||
           |    |       |   ____________|||         |    |       |   ____________|||
           |    |       |  /        ___ |||         |    |       |  /        ___ |||
           |    |       \\/  -2 + \/ 5  /||         |    |       \\/  -2 + \/ 5  /||
           |    | -----------------------||         |    | -----------------------||
           |    |            2           ||         |    |            2           ||
x7 = - 2*re\atan\e                       // - 2*I*im\atan\e                       //
$$x_{7} = - 2 \operatorname{re}{\left(\operatorname{atan}{\left(e^{\frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)} - 2 i \operatorname{im}{\left(\operatorname{atan}{\left(e^{\frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)}$$
         /    /       /       2       \\\         /    /       /       2       \\\
         |    | I*atan|---------------|||         |    | I*atan|---------------|||
         |    |       |   ____________|||         |    |       |   ____________|||
         |    |       |  /        ___ |||         |    |       |  /        ___ |||
         |    |       \\/  -2 + \/ 5  /||         |    |       \\/  -2 + \/ 5  /||
         |    | -----------------------||         |    | -----------------------||
         |    |            2           ||         |    |            2           ||
x8 = 2*re\atan\e                       // + 2*I*im\atan\e                       //
$$x_{8} = 2 \operatorname{re}{\left(\operatorname{atan}{\left(e^{\frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)} + 2 i \operatorname{im}{\left(\operatorname{atan}{\left(e^{\frac{i \operatorname{atan}{\left(\frac{2}{\sqrt{-2 + \sqrt{5}}} \right)}}{2}} \right)}\right)}$$
x8 = 2*re(atan(exp(i*atan(2/sqrt(-2 + sqrt(5)))/2))) + 2*i*im(atan(exp(i*atan(2/sqrt(-2 + sqrt(5)))/2)))
Respuesta numérica [src]
x1 = -3.14159265358979 - 0.721817737589405*i
x2 = 3.14159265358979 + 0.721817737589405*i
x3 = -0.721817737589405*i
x4 = 0.721817737589405*i
x5 = -1.5707963267949 + 0.721817737589405*i
x6 = 1.5707963267949 - 0.721817737589405*i
x7 = -1.5707963267949 - 0.721817737589405*i
x8 = 1.5707963267949 + 0.721817737589405*i
x8 = 1.5707963267949 + 0.721817737589405*i