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Q.

cosxsinx1+sin2xdx is equal to

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a

(sinx+cosx)+C

b

None of the above

c

1(sinx+cosx)+C

d

sinx+cosx+C

answer is C.

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Detailed Solution

LetI=cosxsinx1+sin2xdx=cosxsinxsin2x+cos2x+2sinxcosxdx sin2x+cos2x=1;sin2x=2sinxcosx=cosxsinx(sinx+cosx)2dx

Let cosx+sinx=tsinx+cosx=dtdx

 dx=dt(cosxsinx) I=cosxsinxt2dt(cosxsinx)=1t2dt=t2dt=t2+12+1+C=1cosx+sinx+C

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