I have a question that's restricted to a certain domain (I guess). Obviously I only give the answers that fall in there. The question goes like this:

0 < theta < pi/2 So I know it's between 0-90 degrees.

I have cos(theta) = 3/5

I have to find sin(2theta) which is 2sin(theta)cos(theta) so my little cheat sheet says. Do I just fill in 3/5 to that equation? It seems easy enough I guess. I am just confirming what I am doing is actually right. Thanks a million in advance.