1. The problem statement, all variables and given/known data Superposition of two cosine waves with different periods and different amplitudes. 2. Relevant equations This is basically: acos(y*t) + bcos(x*t) 3. The attempt at a solution I looked at different trig functions but it seems it is not a standard solution. I've found solutions for different amplitudes (but the same periods) but am unable to find one for different amplitudes and periods. Can anyone help?