# How do you find the intersections points of #y=-cosx# and #y=sin(2x)#?

##### 1 Answer

Dec 15, 2016

Please see the explanation.

#### Explanation:

Given:

Subtract equation [1] from equation [2]:

Substitute

Factor:

This works just like when you factor a quadratic:

The corresponding x values for the above are well known:

where n is any negative or positive integer, including zero.