Question

Cos(2x)=1/2 how do u find the exact values

Answer 1

the definition for cos is: adj/hyp of right triangle.

so the adj side is 1; the hyp is 2;

We can draw this, or you can just remember the angle that has a cos of 1/2...60 degrees;

2x = 60

x = 60/2 = 30

Answer 2

there is a second angle with a cos=1/2... -60; or x = -30