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**1. Homework Statement**

I know the rms of a half wave is half the peak value. But the peak value is not given to me. Instead, the V(t) function of 4cos(20pi(x)) is given. Also the period T = 100ms

**2. Homework Equations**

vrms = vpeak/2

But the peak is not given!

**3. The Attempt at a Solution**

Im not sure exactly how to integrate it in order to obtain the peak value and then divide it by 2 in order to get the rms. Much help is appreciated!