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Q.

Derivative of sin2x w.r.t (logx)2 is

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a

x sin x cos xlog x

b

2sin x cos xlog x2

c

sin2 x2 log x

d

x log x

answer is A.

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Detailed Solution

Let y=sin2x and z=logx2

Differentiate both functions with respect to x

     dydx=2sinxcosx

     dzdx=2logx1x

The derivative of y with respect to z is 

   dydz=dydx·dxdz =2sinxcosx·12logx1x =xsinxcosxlogx 

Therefore, the derivative of sin2x with respect to (logx)2 is xsinxcosxlogx

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Derivative of sin2x w.r.t (logx)2 is