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**1. Homework Statement**

8sin(200t) - 6 cos(200t - pi/4)

**2. Homework Equations**

**3. The Attempt at a Solution**

I'm trying to calculate the average power for that expression so:

I need to get that expression into either one term with the same frequency and phase angle or two terms with a different frequency.

I've tried a bunch of different methods but can't quite get anything..

I've tried to turn 8sin(200t) into 4cos(100t)sin(100t) = 4cos(100t)cos(100t - pi/2) but then I get stuck with cosines multiplying each other.

Any help?