Thread: Help with function and its period

Hey, this function has made me lose my sleep
I'd really appreciate if someone could help me out solving it
Here it is:

How can I procceed with this?

y= 4cos(x/2) - 3 sin(2x)

I also want to know its period
Is there any other way to find it out, but graphing it?

check out this link.

http://www.mathhelpforum.com/math-he...-function.html