Question

calcule x, sabendo que cos^2 x - sen^2 x = 0

Answer 1

Resposta:

$cos^2x-sen^2x=0$

$cos2x=0$

$2x=arccos(0)$

$2x= (2k+1)\frac{\pi}{2}$

$x= \frac{1}{2} (2k+1)\frac{\pi}{2}$

$x= (2k+1)\frac{\pi}{4}$

$x= k\frac{\pi}{2} +\frac{\pi}{4},\ \ \ k \in Z$

Answer 2

Resposta:

x=pi/4

Explicação passo-a-passo: