Sr Examen

Otras calculadoras

tan4(x)=-1 la ecuación

El profesor se sorprenderá mucho al ver tu solución correcta😉

v

Solución numérica:

Buscar la solución numérica en el intervalo [, ]

Solución

Ha introducido [src]
   4        
tan (x) = -1
$$\tan^{4}{\left(x \right)} = -1$$
Solución detallada
Tenemos la ecuación
$$\tan^{4}{\left(x \right)} = -1$$
cambiamos
$$\tan^{4}{\left(x \right)} + 1 = 0$$
$$\tan^{4}{\left(x \right)} + 1 = 0$$
Sustituimos
$$w = \tan{\left(x \right)}$$
Tenemos la ecuación
$$w^{4} + 1 = 0$$
Ya que la potencia en la ecuación es igual a = 4 y miembro libre = -1 < 0,
significa que la ecuación correspondiente no tiene soluciones reales

Las demás 4 raíces son complejas.
hacemos el cambio:
$$z = w$$
entonces la ecuación será así:
$$z^{4} = -1$$
Cualquier número complejo se puede presentar que:
$$z = r e^{i p}$$
sustituimos en la ecuación
$$r^{4} e^{4 i p} = -1$$
donde
$$r = 1$$
- módulo del número complejo
Sustituyamos r:
$$e^{4 i p} = -1$$
Usando la fórmula de Euler hallemos las raíces para p
$$i \sin{\left(4 p \right)} + \cos{\left(4 p \right)} = -1$$
es decir
$$\cos{\left(4 p \right)} = -1$$
y
$$\sin{\left(4 p \right)} = 0$$
entonces
$$p = \frac{\pi N}{2} + \frac{\pi}{4}$$
donde N=0,1,2,3,...
Seleccionando los valores de N y sustituyendo p en la fórmula para z
Es decir, la solución será para z:
$$z_{1} = - \frac{\sqrt{2}}{2} - \frac{\sqrt{2} i}{2}$$
$$z_{2} = - \frac{\sqrt{2}}{2} + \frac{\sqrt{2} i}{2}$$
$$z_{3} = \frac{\sqrt{2}}{2} - \frac{\sqrt{2} i}{2}$$
$$z_{4} = \frac{\sqrt{2}}{2} + \frac{\sqrt{2} i}{2}$$
hacemos cambio inverso
$$z = w$$
$$w = z$$

Entonces la respuesta definitiva es:
$$w_{1} = - \frac{\sqrt{2}}{2} - \frac{\sqrt{2} i}{2}$$
$$w_{2} = - \frac{\sqrt{2}}{2} + \frac{\sqrt{2} i}{2}$$
$$w_{3} = \frac{\sqrt{2}}{2} - \frac{\sqrt{2} i}{2}$$
$$w_{4} = \frac{\sqrt{2}}{2} + \frac{\sqrt{2} i}{2}$$
hacemos cambio inverso
$$\tan{\left(x \right)} = w$$
Tenemos la ecuación
$$\tan{\left(x \right)} = w$$
es la ecuación trigonométrica más simple
Esta ecuación se reorganiza en
$$x = \pi n + \operatorname{atan}{\left(w \right)}$$
O
$$x = \pi n + \operatorname{atan}{\left(w \right)}$$
, donde n es cualquier número entero
sustituimos w:
Gráfica
Respuesta rápida [src]
         /    /  ___       ___\\       /    /  ___       ___\\
         |    |\/ 2    I*\/ 2 ||       |    |\/ 2    I*\/ 2 ||
x1 = - re|atan|----- - -------|| - I*im|atan|----- - -------||
         \    \  2        2   //       \    \  2        2   //
$$x_{1} = - \operatorname{re}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} - \frac{\sqrt{2} i}{2} \right)}\right)} - i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} - \frac{\sqrt{2} i}{2} \right)}\right)}$$
         /    /  ___       ___\\     /    /  ___       ___\\
         |    |\/ 2    I*\/ 2 ||     |    |\/ 2    I*\/ 2 ||
x2 = I*im|atan|----- - -------|| + re|atan|----- - -------||
         \    \  2        2   //     \    \  2        2   //
$$x_{2} = \operatorname{re}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} - \frac{\sqrt{2} i}{2} \right)}\right)} + i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} - \frac{\sqrt{2} i}{2} \right)}\right)}$$
         /    /  ___       ___\\       /    /  ___       ___\\
         |    |\/ 2    I*\/ 2 ||       |    |\/ 2    I*\/ 2 ||
x3 = - re|atan|----- + -------|| - I*im|atan|----- + -------||
         \    \  2        2   //       \    \  2        2   //
$$x_{3} = - \operatorname{re}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} + \frac{\sqrt{2} i}{2} \right)}\right)} - i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} + \frac{\sqrt{2} i}{2} \right)}\right)}$$
         /    /  ___       ___\\     /    /  ___       ___\\
         |    |\/ 2    I*\/ 2 ||     |    |\/ 2    I*\/ 2 ||
x4 = I*im|atan|----- + -------|| + re|atan|----- + -------||
         \    \  2        2   //     \    \  2        2   //
$$x_{4} = \operatorname{re}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} + \frac{\sqrt{2} i}{2} \right)}\right)} + i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} + \frac{\sqrt{2} i}{2} \right)}\right)}$$
x4 = re(atan(sqrt(2)/2 + sqrt(2)*i/2)) + i*im(atan(sqrt(2)/2 + sqrt(2)*i/2))
Suma y producto de raíces [src]
suma
    /    /  ___       ___\\       /    /  ___       ___\\       /    /  ___       ___\\     /    /  ___       ___\\       /    /  ___       ___\\       /    /  ___       ___\\       /    /  ___       ___\\     /    /  ___       ___\\
    |    |\/ 2    I*\/ 2 ||       |    |\/ 2    I*\/ 2 ||       |    |\/ 2    I*\/ 2 ||     |    |\/ 2    I*\/ 2 ||       |    |\/ 2    I*\/ 2 ||       |    |\/ 2    I*\/ 2 ||       |    |\/ 2    I*\/ 2 ||     |    |\/ 2    I*\/ 2 ||
- re|atan|----- - -------|| - I*im|atan|----- - -------|| + I*im|atan|----- - -------|| + re|atan|----- - -------|| + - re|atan|----- + -------|| - I*im|atan|----- + -------|| + I*im|atan|----- + -------|| + re|atan|----- + -------||
    \    \  2        2   //       \    \  2        2   //       \    \  2        2   //     \    \  2        2   //       \    \  2        2   //       \    \  2        2   //       \    \  2        2   //     \    \  2        2   //
$$\left(\left(\left(\operatorname{re}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} - \frac{\sqrt{2} i}{2} \right)}\right)} + i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} - \frac{\sqrt{2} i}{2} \right)}\right)}\right) + \left(- \operatorname{re}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} - \frac{\sqrt{2} i}{2} \right)}\right)} - i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} - \frac{\sqrt{2} i}{2} \right)}\right)}\right)\right) + \left(- \operatorname{re}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} + \frac{\sqrt{2} i}{2} \right)}\right)} - i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} + \frac{\sqrt{2} i}{2} \right)}\right)}\right)\right) + \left(\operatorname{re}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} + \frac{\sqrt{2} i}{2} \right)}\right)} + i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} + \frac{\sqrt{2} i}{2} \right)}\right)}\right)$$
=
0
$$0$$
producto
/    /    /  ___       ___\\       /    /  ___       ___\\\ /    /    /  ___       ___\\     /    /  ___       ___\\\ /    /    /  ___       ___\\       /    /  ___       ___\\\ /    /    /  ___       ___\\     /    /  ___       ___\\\
|    |    |\/ 2    I*\/ 2 ||       |    |\/ 2    I*\/ 2 ||| |    |    |\/ 2    I*\/ 2 ||     |    |\/ 2    I*\/ 2 ||| |    |    |\/ 2    I*\/ 2 ||       |    |\/ 2    I*\/ 2 ||| |    |    |\/ 2    I*\/ 2 ||     |    |\/ 2    I*\/ 2 |||
|- re|atan|----- - -------|| - I*im|atan|----- - -------|||*|I*im|atan|----- - -------|| + re|atan|----- - -------|||*|- re|atan|----- + -------|| - I*im|atan|----- + -------|||*|I*im|atan|----- + -------|| + re|atan|----- + -------|||
\    \    \  2        2   //       \    \  2        2   /// \    \    \  2        2   //     \    \  2        2   /// \    \    \  2        2   //       \    \  2        2   /// \    \    \  2        2   //     \    \  2        2   ///
$$\left(- \operatorname{re}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} - \frac{\sqrt{2} i}{2} \right)}\right)} - i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} - \frac{\sqrt{2} i}{2} \right)}\right)}\right) \left(\operatorname{re}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} - \frac{\sqrt{2} i}{2} \right)}\right)} + i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} - \frac{\sqrt{2} i}{2} \right)}\right)}\right) \left(- \operatorname{re}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} + \frac{\sqrt{2} i}{2} \right)}\right)} - i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} + \frac{\sqrt{2} i}{2} \right)}\right)}\right) \left(\operatorname{re}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} + \frac{\sqrt{2} i}{2} \right)}\right)} + i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{\sqrt{2}}{2} + \frac{\sqrt{2} i}{2} \right)}\right)}\right)$$
=
                                                     2                                                      2
/    /    /  ___        \\     /    /  ___        \\\  /    /    /  ___        \\     /    /  ___        \\\ 
|    |    |\/ 2 *(1 + I)||     |    |\/ 2 *(1 + I)|||  |    |    |\/ 2 *(1 - I)||     |    |\/ 2 *(1 - I)||| 
|I*im|atan|-------------|| + re|atan|-------------||| *|I*im|atan|-------------|| + re|atan|-------------||| 
\    \    \      2      //     \    \      2      ///  \    \    \      2      //     \    \      2      /// 
$$\left(\operatorname{re}{\left(\operatorname{atan}{\left(\frac{\sqrt{2} \left(1 - i\right)}{2} \right)}\right)} + i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{\sqrt{2} \left(1 - i\right)}{2} \right)}\right)}\right)^{2} \left(\operatorname{re}{\left(\operatorname{atan}{\left(\frac{\sqrt{2} \left(1 + i\right)}{2} \right)}\right)} + i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{\sqrt{2} \left(1 + i\right)}{2} \right)}\right)}\right)^{2}$$
(i*im(atan(sqrt(2)*(1 + i)/2)) + re(atan(sqrt(2)*(1 + i)/2)))^2*(i*im(atan(sqrt(2)*(1 - i)/2)) + re(atan(sqrt(2)*(1 - i)/2)))^2
Respuesta numérica [src]
x1 = -0.785398163397448 + 0.440686793509772*i
x2 = 0.785398163397448 - 0.440686793509772*i
x3 = -0.785398163397448 - 0.440686793509772*i
x4 = 0.785398163397448 + 0.440686793509772*i
x4 = 0.785398163397448 + 0.440686793509772*i