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OpenStudy (anonymous):
The amplitude and period of y = cos3xcos7x + sin3xsin7x are ?
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OpenStudy (anonymous):
I was reading that lol :)
OpenStudy (anonymous):
cos3xcos7x + sin3xsin7x =cos(7x-3x)=cos4x for cos function, amplitude =1 therefore cos4x, amplitude is the same which is 1 period of cosx = 360 that of cos 4x = 360/4 = 90
OpenStudy (anonymous):
I have some amendment. Sorry for that
OpenStudy (anonymous):
why is period of cos x = 360 ?
OpenStudy (anonymous):
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