Question

How do you find the exact value of `cos^-1(1/2)`?

Answer 1

60 degrees

Explanation:

`cos^-1` (1/2)
means the angle whose cosine is `1/2`

Draw an equilateral triangle , cut it in half,: the ratio of the sides

is 1:2:`sqrt3`

The angle whose cosine is `1/2` is 60 degrees.