Question

Evaluate cos(60

Answer 1

First, convert 60⁰  in radians just for the sake of convenience of problem-solving in trigonometry. 

$180^0 = \pi \\ 60^0 = \frac{60}{180} \pi\\ 60^0 = \frac{\pi}{3}\\ \implies \cos(\frac{\pi}{3})= \frac{1}{2}$