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`sin^(3)xcos^(3)x` |
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Answer» Let `y=sin^(3)xcos^(3)x` `(dy)/(dx) = sin^(3).x.d/(dx)cos^(3)x+cos^(3)xd/(dx)sin^(3)x` [By product rule] `=sin^(3)x.3cos^(2)x(-sinx) + cos^(3)x. 3sin^(2)xcosx` [By chain rule] `=-3cos^(2)xcos^(2)x(cos^(2)x-sin^(2)x)` `=3sin^(2)xcos^(2)xcos2x` `=3/4(2sinxcosx)^(2)cos2x` `=3/4sin^(2)2xcos2x` |
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