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#1 Re: Help Me ! » trignometry » 2013-07-28 03:07:46

Thanks Bob.
That's what I suspected.
I'll just plot graphically what I want to see.

#2 Help Me ! » trignometry » 2013-07-24 07:42:42

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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