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OpenStudy (anonymous):
The amplitude and period of y = cos3xcos7x + sin3xsin7x are ?
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OpenStudy (callisto):
y = cos3xcos7x + sin3xsin7x = cos (3x-7x) = cos (-4x) = cos4x For amplitude, I think it should be the same as the ordinary case?! For period, i think it would be reduced by 1/4, that is pi/2 ?! I'm not sure...
OpenStudy (anonymous):
Amp = 1 and Period = pi/2 so you got the period correct but i dont get the Amp though ?
OpenStudy (callisto):
there is no change in amplitude as there is no enlargement along y-axis.. If you see it is like y = kf(x) there is some change in the amplitude. But for this case, it's not
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