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## Homework Statement

ok so im given that I(t) = A cos (w1 t)cos(w2 t)

where w2<<w1

then im asked to express I as the sum of two cosine functions with angular frequences P and Q which I have:

I = A/2 (cosPt + cosQt) where P = w1+w2 and Q=w1-w2

Im then asked to evaluate the bandwith in terms of w1 and w2

Is this just |P-Q| in which case it would be 2w2? im confused :S thanks