# Math Help - Hyperbolic function?

1. ## Hyperbolic function?

Find all solutions of cos x = 1/2 in the interval [-3pi,3pi].

Could someone explain how to solve this? Cheers.

2. Originally Posted by Haris
Find all solutions of cos x = 1/2 in the interval [-3pi,3pi].

Could someone explain how to solve this? Cheers.
First I would graph the function on the interval $[-3\pi,3\pi]$ to find the number of times $\cos x = \frac{1}{2}$. From th symmetry of the cosine curve and knowing that one answer is $x = \frac{\pi}{3}$ should get you the rest.