Originally Posted by

**overduex** Hi! If anyone could please explain this, I would really appreciate it.

Thanks in advance!

I'm doing my math hw and trying to use the calculator as little as possible.

one of the problems is verifying the x-value.

the step I am currently on looks like this:

**4cos^2 (45 degrees) -2 =0**

my question is. Could anyone possibly explain how to find 4cos^2 (45) by hand (not using a calculator)????? When I put it into the calculator it says te answer is 2. But I want to know how to find that by hand...is it possible???

do you square the 45 first and then multiply by 4 and find the cos of that?????

thanks again!!!

and please let me know if my question does not make sense :/