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Q.

x2(xsinx+cosx)2dx=

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a

xcosx(x sinx+cosx)-tanx+c

b

xcosx(x sinx+cosx)+tanx+c

c

-xcosx(x sinx+cosx)-tanx+c

d

-xcosx(x sinx+cosx)+tanx+c

answer is C.

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Detailed Solution

I=x2(x sin x+cos x)2dx =xcos x.x cos x(x sin x+cos x)2dx now consider x cos x(x sin x+cos x)dx ==dtt2-1t+c=-1x sin x+cos xPut x sin x+cos x=t(x cos s+sin x(1)-sin x)dx=dtx cos x dx=dt no I=xcos x.x cos x(x sin x+cos x)2dx                                                            First Function       Second Function   by using, by parts =xcos x-1x sin x+cos x-cos x(1)-x(-sin x)cos2x×-1(x sin x+cos x)dx =-xcos x (x sin x+cos x)+ sec2x dx =-xcos x(x sin x+cos x)+tan x+c

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