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 :/
