# Solve cosz=2

1. Mar 10, 2009

### kathrynag

1. The problem statement, all variables and given/known data

Sove cosz=2

2. Relevant equations

3. The attempt at a solution
I need to solve this, but am not quite sure how. I was told to use log.

2. Mar 11, 2009

### lanedance

Hi kathrynag welcome to pf

i assume you're working with complex numbers...

does the complex expression of cos help
$$\cos{z} = \frac{e^{iz}+e^{-iz}}{2}$$