1. The problem statement, all variables and given/known data Determine the rms value of v(t) = 15 + 10cos(20πt) 2. Relevant equations Vrms = √(1/T*∫T0v2dt 3. The attempt at a solution √(10*∫0.10[15+10cos(20πt)]2dt Unless, I'm much mistaken I should be able to plug the equation into the formula I have given above. I used the integral function on my calculator to do the calculation and I got 24.98V but the answer is supposed to be 16.58V Any suggestions for where I'm going wrong?