# Trig. :s

1. Mar 16, 2009

### ibysaiyan

1. The problem statement, all variables and given/known data
Find the values of (theta),in the interval 0degree$$\leq(theta)$$$$\leq180$$,for which cos2theta=1/4.Give your answers correct to the nearest integers.

2. Relevant equations
:s

3. The attempt at a solution
do i just tap them in the calculator or how?

2. Mar 16, 2009

### Dick

I would start by sketching a graph of the function first. You should be able to see that there are two possible values of theta. Then sure, use your calculator to find them.