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Q.

The integral  x2sec2xdx(1+xtanx)(xtanx)is equal to (where C is the constant of integration)

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a

loge(1+xtanx)(xtanx)+C

b

x+loge(1+xtanx)(xtanx)+C

c

xloge(1+xtanx)(xtanx)+C

d

loge(1+xtanx)(xtanx)+C

answer is D.

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Detailed Solution

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Given integral =x2dx(cosx+xsinx)(xcosxsinx)
=xcosx(xcosxsinx)+xsinx(cosx+xsinx)(cosx+xsinx)(xcosxsinx)dx
=xcosxcosx+xsinxdxxsinxxcosxsinxdx=logecosx+xsinx        logexcosxsinx+C =logecosx+xsinxxcosxsinx+c =loge(1+xtanx)(xtanx)+C

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