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cos2x+5cosx+a=0 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
cos(2*x) + 5*cos(x) + a = 0
$$a + \left(5 \cos{\left(x \right)} + \cos{\left(2 x \right)}\right) = 0$$
Solución detallada
Tenemos la ecuación
$$a + \left(5 \cos{\left(x \right)} + \cos{\left(2 x \right)}\right) = 0$$
cambiamos
$$a + 5 \cos{\left(x \right)} + \cos{\left(2 x \right)} = 0$$
$$a + 2 \cos^{2}{\left(x \right)} + 5 \cos{\left(x \right)} - 1 = 0$$
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
$$a = 2$$
$$b = 5$$
$$c = a - 1$$
, entonces
D = b^2 - 4 * a * c = 

(5)^2 - 4 * (2) * (-1 + a) = 33 - 8*a

La ecuación tiene dos raíces.
w1 = (-b + sqrt(D)) / (2*a)

w2 = (-b - sqrt(D)) / (2*a)

o
$$w_{1} = \frac{\sqrt{33 - 8 a}}{4} - \frac{5}{4}$$
$$w_{2} = - \frac{\sqrt{33 - 8 a}}{4} - \frac{5}{4}$$
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:
$$x_{1} = \pi n + \operatorname{acos}{\left(w_{1} \right)}$$
$$x_{1} = \pi n + \operatorname{acos}{\left(\frac{\sqrt{33 - 8 a}}{4} - \frac{5}{4} \right)}$$
$$x_{1} = \pi n + \operatorname{acos}{\left(\frac{\sqrt{33 - 8 a}}{4} - \frac{5}{4} \right)}$$
$$x_{2} = \pi n + \operatorname{acos}{\left(w_{2} \right)}$$
$$x_{2} = \pi n + \operatorname{acos}{\left(- \frac{\sqrt{33 - 8 a}}{4} - \frac{5}{4} \right)}$$
$$x_{2} = \pi n + \operatorname{acos}{\left(- \frac{\sqrt{33 - 8 a}}{4} - \frac{5}{4} \right)}$$
$$x_{3} = \pi n + \operatorname{acos}{\left(w_{1} \right)} - \pi$$
$$x_{3} = \pi n + \operatorname{acos}{\left(\frac{\sqrt{33 - 8 a}}{4} - \frac{5}{4} \right)} - \pi$$
$$x_{3} = \pi n + \operatorname{acos}{\left(\frac{\sqrt{33 - 8 a}}{4} - \frac{5}{4} \right)} - \pi$$
$$x_{4} = \pi n + \operatorname{acos}{\left(w_{2} \right)} - \pi$$
$$x_{4} = \pi n + \operatorname{acos}{\left(- \frac{\sqrt{33 - 8 a}}{4} - \frac{5}{4} \right)} - \pi$$
$$x_{4} = \pi n + \operatorname{acos}{\left(- \frac{\sqrt{33 - 8 a}}{4} - \frac{5}{4} \right)} - \pi$$
Gráfica
Respuesta rápida [src]
            /|                              ___________________________|\                                                                
            ||        __________     ___   /                __________ ||      /                             ___________________________\
            ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  ||      |       __________     ___   /                __________ |
x1 = - I*log||- - - ------------ - ------------------------------------|| + arg\-5 - \/ 33 - 8*a  - \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  /
            \|  4        4                          4                  |/                                                                
$$x_{1} = - i \log{\left(\left|{- \frac{\sqrt{33 - 8 a}}{4} - \frac{\sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} + \arg{\left(- \sqrt{33 - 8 a} - \sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21} - 5 \right)}$$
            /|                              ___________________________|\                                                                
            ||        __________     ___   /                __________ ||      /                             ___________________________\
            ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  ||      |       __________     ___   /                __________ |
x2 = - I*log||- - - ------------ + ------------------------------------|| + arg\-5 - \/ 33 - 8*a  + \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  /
            \|  4        4                          4                  |/                                                                
$$x_{2} = - i \log{\left(\left|{- \frac{\sqrt{33 - 8 a}}{4} + \frac{\sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} + \arg{\left(- \sqrt{33 - 8 a} + \sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21} - 5 \right)}$$
            /|                              ___________________________|\                                                                
            ||        __________     ___   /          __________       ||      /                             ___________________________\
            ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a ||      |       __________     ___   /          __________       |
x3 = - I*log||- - + ------------ - ------------------------------------|| + arg\-5 + \/ 33 - 8*a  - \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a /
            \|  4        4                          4                  |/                                                                
$$x_{3} = - i \log{\left(\left|{\frac{\sqrt{33 - 8 a}}{4} - \frac{\sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} + \arg{\left(\sqrt{33 - 8 a} - \sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21} - 5 \right)}$$
            /|                              ___________________________|\                                                                
            ||        __________     ___   /          __________       ||      /                             ___________________________\
            ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a ||      |       __________     ___   /          __________       |
x4 = - I*log||- - + ------------ + ------------------------------------|| + arg\-5 + \/ 33 - 8*a  + \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a /
            \|  4        4                          4                  |/                                                                
$$x_{4} = - i \log{\left(\left|{\frac{\sqrt{33 - 8 a}}{4} + \frac{\sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} + \arg{\left(\sqrt{33 - 8 a} + \sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21} - 5 \right)}$$
x4 = -i*log(Abs(sqrt(33 - 8*a)/4 + sqrt(2)*sqrt(-4*a - 5*sqrt(33 - 8*a) + 21)/4 - 5/4)) + arg(sqrt(33 - 8*a) + sqrt(2)*sqrt(-4*a - 5*sqrt(33 - 8*a) + 21) - 5)
Suma y producto de raíces [src]
suma
       /|                              ___________________________|\                                                                          /|                              ___________________________|\                                                                          /|                              ___________________________|\                                                                          /|                              ___________________________|\                                                                
       ||        __________     ___   /                __________ ||      /                             ___________________________\          ||        __________     ___   /                __________ ||      /                             ___________________________\          ||        __________     ___   /          __________       ||      /                             ___________________________\          ||        __________     ___   /          __________       ||      /                             ___________________________\
       ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  ||      |       __________     ___   /                __________ |          ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  ||      |       __________     ___   /                __________ |          ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a ||      |       __________     ___   /          __________       |          ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a ||      |       __________     ___   /          __________       |
- I*log||- - - ------------ - ------------------------------------|| + arg\-5 - \/ 33 - 8*a  - \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  / + - I*log||- - - ------------ + ------------------------------------|| + arg\-5 - \/ 33 - 8*a  + \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  / + - I*log||- - + ------------ - ------------------------------------|| + arg\-5 + \/ 33 - 8*a  - \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a / + - I*log||- - + ------------ + ------------------------------------|| + arg\-5 + \/ 33 - 8*a  + \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a /
       \|  4        4                          4                  |/                                                                          \|  4        4                          4                  |/                                                                          \|  4        4                          4                  |/                                                                          \|  4        4                          4                  |/                                                                
$$\left(- i \log{\left(\left|{\frac{\sqrt{33 - 8 a}}{4} + \frac{\sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} + \arg{\left(\sqrt{33 - 8 a} + \sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21} - 5 \right)}\right) + \left(\left(- i \log{\left(\left|{\frac{\sqrt{33 - 8 a}}{4} - \frac{\sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} + \arg{\left(\sqrt{33 - 8 a} - \sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21} - 5 \right)}\right) + \left(\left(- i \log{\left(\left|{- \frac{\sqrt{33 - 8 a}}{4} - \frac{\sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} + \arg{\left(- \sqrt{33 - 8 a} - \sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21} - 5 \right)}\right) + \left(- i \log{\left(\left|{- \frac{\sqrt{33 - 8 a}}{4} + \frac{\sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} + \arg{\left(- \sqrt{33 - 8 a} + \sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21} - 5 \right)}\right)\right)\right)$$
=
       /|                              ___________________________|\        /|                              ___________________________|\        /|                              ___________________________|\        /|                              ___________________________|\                                                                                                                                                                                                                                                                
       ||        __________     ___   /                __________ ||        ||        __________     ___   /                __________ ||        ||        __________     ___   /          __________       ||        ||        __________     ___   /          __________       ||      /                             ___________________________\      /                             ___________________________\      /                             ___________________________\      /                             ___________________________\
       ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  ||        ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  ||        ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a ||        ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a ||      |       __________     ___   /          __________       |      |       __________     ___   /          __________       |      |       __________     ___   /                __________ |      |       __________     ___   /                __________ |
- I*log||- - - ------------ - ------------------------------------|| - I*log||- - - ------------ + ------------------------------------|| - I*log||- - + ------------ - ------------------------------------|| - I*log||- - + ------------ + ------------------------------------|| + arg\-5 + \/ 33 - 8*a  + \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a / + arg\-5 + \/ 33 - 8*a  - \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a / + arg\-5 - \/ 33 - 8*a  + \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  / + arg\-5 - \/ 33 - 8*a  - \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  /
       \|  4        4                          4                  |/        \|  4        4                          4                  |/        \|  4        4                          4                  |/        \|  4        4                          4                  |/                                                                                                                                                                                                                                                                
$$- i \log{\left(\left|{- \frac{\sqrt{33 - 8 a}}{4} - \frac{\sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} - i \log{\left(\left|{- \frac{\sqrt{33 - 8 a}}{4} + \frac{\sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} - i \log{\left(\left|{\frac{\sqrt{33 - 8 a}}{4} - \frac{\sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} - i \log{\left(\left|{\frac{\sqrt{33 - 8 a}}{4} + \frac{\sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} + \arg{\left(- \sqrt{33 - 8 a} - \sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21} - 5 \right)} + \arg{\left(- \sqrt{33 - 8 a} + \sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21} - 5 \right)} + \arg{\left(\sqrt{33 - 8 a} - \sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21} - 5 \right)} + \arg{\left(\sqrt{33 - 8 a} + \sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21} - 5 \right)}$$
producto
/       /|                              ___________________________|\                                                                \ /       /|                              ___________________________|\                                                                \ /       /|                              ___________________________|\                                                                \ /       /|                              ___________________________|\                                                                \
|       ||        __________     ___   /                __________ ||      /                             ___________________________\| |       ||        __________     ___   /                __________ ||      /                             ___________________________\| |       ||        __________     ___   /          __________       ||      /                             ___________________________\| |       ||        __________     ___   /          __________       ||      /                             ___________________________\|
|       ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  ||      |       __________     ___   /                __________ || |       ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  ||      |       __________     ___   /                __________ || |       ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a ||      |       __________     ___   /          __________       || |       ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a ||      |       __________     ___   /          __________       ||
|- I*log||- - - ------------ - ------------------------------------|| + arg\-5 - \/ 33 - 8*a  - \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  /|*|- I*log||- - - ------------ + ------------------------------------|| + arg\-5 - \/ 33 - 8*a  + \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  /|*|- I*log||- - + ------------ - ------------------------------------|| + arg\-5 + \/ 33 - 8*a  - \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a /|*|- I*log||- - + ------------ + ------------------------------------|| + arg\-5 + \/ 33 - 8*a  + \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a /|
\       \|  4        4                          4                  |/                                                                / \       \|  4        4                          4                  |/                                                                / \       \|  4        4                          4                  |/                                                                / \       \|  4        4                          4                  |/                                                                /
$$\left(- i \log{\left(\left|{- \frac{\sqrt{33 - 8 a}}{4} - \frac{\sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} + \arg{\left(- \sqrt{33 - 8 a} - \sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21} - 5 \right)}\right) \left(- i \log{\left(\left|{- \frac{\sqrt{33 - 8 a}}{4} + \frac{\sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} + \arg{\left(- \sqrt{33 - 8 a} + \sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21} - 5 \right)}\right) \left(- i \log{\left(\left|{\frac{\sqrt{33 - 8 a}}{4} - \frac{\sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} + \arg{\left(\sqrt{33 - 8 a} - \sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21} - 5 \right)}\right) \left(- i \log{\left(\left|{\frac{\sqrt{33 - 8 a}}{4} + \frac{\sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} + \arg{\left(\sqrt{33 - 8 a} + \sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21} - 5 \right)}\right)$$
=
/                                                                       /|                              ___________________________|\\ /                                                                       /|                              ___________________________|\\ /                                                                       /|                              ___________________________|\\ /                                                                       /|                              ___________________________|\\
|     /                             ___________________________\        ||        __________     ___   /          __________       ||| |     /                             ___________________________\        ||        __________     ___   /          __________       ||| |     /                             ___________________________\        ||        __________     ___   /                __________ ||| |     /                             ___________________________\        ||        __________     ___   /                __________ |||
|     |       __________     ___   /          __________       |        ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a ||| |     |       __________     ___   /          __________       |        ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a ||| |     |       __________     ___   /                __________ |        ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  ||| |     |       __________     ___   /                __________ |        ||  5   \/ 33 - 8*a    \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  |||
|- arg\-5 + \/ 33 - 8*a  + \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a / + I*log||- - + ------------ + ------------------------------------|||*|- arg\-5 + \/ 33 - 8*a  - \/ 2 *\/  21 - 5*\/ 33 - 8*a  - 4*a / + I*log||- - + ------------ - ------------------------------------|||*|- arg\-5 - \/ 33 - 8*a  + \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  / + I*log||- - - ------------ + ------------------------------------|||*|- arg\-5 - \/ 33 - 8*a  - \/ 2 *\/  21 - 4*a + 5*\/ 33 - 8*a  / + I*log||- - - ------------ - ------------------------------------|||
\                                                                       \|  4        4                          4                  |// \                                                                       \|  4        4                          4                  |// \                                                                       \|  4        4                          4                  |// \                                                                       \|  4        4                          4                  |//
$$\left(i \log{\left(\left|{- \frac{\sqrt{33 - 8 a}}{4} - \frac{\sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} - \arg{\left(- \sqrt{33 - 8 a} - \sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21} - 5 \right)}\right) \left(i \log{\left(\left|{- \frac{\sqrt{33 - 8 a}}{4} + \frac{\sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} - \arg{\left(- \sqrt{33 - 8 a} + \sqrt{2} \sqrt{- 4 a + 5 \sqrt{33 - 8 a} + 21} - 5 \right)}\right) \left(i \log{\left(\left|{\frac{\sqrt{33 - 8 a}}{4} - \frac{\sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} - \arg{\left(\sqrt{33 - 8 a} - \sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21} - 5 \right)}\right) \left(i \log{\left(\left|{\frac{\sqrt{33 - 8 a}}{4} + \frac{\sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21}}{4} - \frac{5}{4}}\right| \right)} - \arg{\left(\sqrt{33 - 8 a} + \sqrt{2} \sqrt{- 4 a - 5 \sqrt{33 - 8 a} + 21} - 5 \right)}\right)$$
(-arg(-5 + sqrt(33 - 8*a) + sqrt(2)*sqrt(21 - 5*sqrt(33 - 8*a) - 4*a)) + i*log(Abs(-5/4 + sqrt(33 - 8*a)/4 + sqrt(2)*sqrt(21 - 5*sqrt(33 - 8*a) - 4*a)/4)))*(-arg(-5 + sqrt(33 - 8*a) - sqrt(2)*sqrt(21 - 5*sqrt(33 - 8*a) - 4*a)) + i*log(Abs(-5/4 + sqrt(33 - 8*a)/4 - sqrt(2)*sqrt(21 - 5*sqrt(33 - 8*a) - 4*a)/4)))*(-arg(-5 - sqrt(33 - 8*a) + sqrt(2)*sqrt(21 - 4*a + 5*sqrt(33 - 8*a))) + i*log(Abs(-5/4 - sqrt(33 - 8*a)/4 + sqrt(2)*sqrt(21 - 4*a + 5*sqrt(33 - 8*a))/4)))*(-arg(-5 - sqrt(33 - 8*a) - sqrt(2)*sqrt(21 - 4*a + 5*sqrt(33 - 8*a))) + i*log(Abs(-5/4 - sqrt(33 - 8*a)/4 - sqrt(2)*sqrt(21 - 4*a + 5*sqrt(33 - 8*a))/4)))