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Thanks Bob.

That's what I suspected.

I'll just plot graphically what I want to see.

**hill0093**- Replies: 2

From common trigonometric formulas, I know that

A cos(2πF1t) + A cos(2πF2t) = 2A cos(2π[(F1-F2)/2]t) cos(2π[(F1+F2)/2]t)

where A is the amplitude of both original cosine functions of t, and F1 and F2 are their respective frequencies, the product demonstrates a modulation of the cosine of the average frequency.

Is there a similar product formula if the two original amplitudes are different, i.e..:

A1 cos(2πF1t) + A2 cos(2πF2t) = ?

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