Solving a Trig equation by graph

I need to use the graphing calculator to approximate, to three decimal places,for the solutions to the homework problems I am working on, giving all the solutions possible.

Here are two of the even ones in the book.

cos(x)=2x^2

x=?

cos(x)=x^2/2

x=?

I would appreciate an example of any method to use so I can grasp this and finish my homework, so I can study for another class. This website is such a help, we are very fortunate to have a site like this to help us better understand the concepts we are being taught.

Thank you very much!!

Keith Stevens