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OpenStudy (anonymous):
nth derivative of y = cos5x.cos3x
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OpenStudy (shubhamsrg):
2cos a cos b = cos(a-b) + cos(a+b) thus cos5x cos3x = (1/2)(cos 2x + cos 8x) rest should be easier i guess?
OpenStudy (shubhamsrg):
i can post the answer if you want..but you should try..
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