Question

Determinar os valores de x pertencentes a [0, 2pi[ TAIS que f(x)= -5+cos 2x​

Answer 1

$\mathsf{f(0)=-5+cos(2.0)=-5+1=-4}$

$\mathsf{f(\dfrac{\pi}{2})=f(\dfrac{3\pi}{2})=-5}$

$\mathsf{f(\pi) =-5+cos(2\pi)=-5+1=-4}$