# How do you solve #4cos^2x-1=0#?

##### 1 Answer

Oct 21, 2016

#### Explanation:

This is a trivial quadratic equation in

In order to solve this you need to be familiar with the graphs of the trig functions along with common values:

The range of soutions is not specified in the question, so lets assume we want a solutio in radians, and

Consider,

Consider,

So the solutions are: