Question

solve the equation if 0≤x≤360. cosx=-1/2

Answer 1

In which quadrant(s) is cos negative?

Answer 2

2 and 3

Answer 3

cos is positive

Answer 4

So we will consider 2nd and 3rd quad.

Answer 5

Basic angle =
x = cos^-1(0.5)
x = 60.

so,
180 - 60
and
180 + 60

Two angles there.