Question

How do you find two solutions (in degree and radians) for `cos x= -1/2`?

Answer 1

Solve cos x = - 1/2

Ans:`+- (2pi)/3`

Explanation:

Trig Table of Special Arcs gives -->
`cos x = - 1/2` --> `x = +- (2pi)/3` (or `x = +- 120^2)`