Question

Resolva, em radianos, a seguinte equação: 3cos x- 3/2 =0

Answer 1

$3\cos x-\dfrac32=0\\\\\\3\cos x=\dfrac32\\\\\\\cos x=\dfrac12\\\\\\x=\dfrac{\pi}{3}+2n\pi\ ou\ x=-\dfrac\pi3+2n\pi, n\in\mathbb{Z}$