Question

Find all solutions to the equation. cos x = - 1/2

Answer 1

Answer:

$x = 2\pi /3 + 2\pi n\\x= 4\pi /3 + 2\pi n$

Step-by-step explanation:

Radian: x = 2\pi /3 + 2\pi n\\x= 4\pi /3 + 2\pi n

Degree:  x = 120 + 360n , x = 240 + 360n