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Question

Given y=5x3(1x)2+cos2(2x+1) (IIT-JEE, 1980)
find dydx.

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Solution

Given y=5x3(1x)2+cos2(2x+1)

Differentiating both sides w.r.t. x, we get

dydx=5[(1x)2/323(1x)1/3(1)](1x)4/3+2cos(2x+1)(sin(2x+1))2

5[(1x)2/323(1x)1/3(1)](1x)4/32sin(4x+2)

=5(33x+2)3(1x)5/32sin(4x+2)

=5(53x)3(1x)5/32sin(4x+2)

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