RMS value of voltage

1. Jan 22, 2007

blanik

The question is "starting from v(t) = Vm cos(wt+theta), show analytically that the RMS value of v(t) is v(t)=Vm/sqrt(2) for any w or theta."

I'm not really sure how to begin this. Do I start by taking the integral?

2. Jan 22, 2007