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Question

esinx(x cos3xsinxcos2x)dx,is equal to

A
esinx(tanx+x)+C
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B
esinx(xsecx)+C
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C
esinx(secx+tanx)+C
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D
None of these
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Solution

The correct option is B esinx(xsecx)+C
We have
esinx(x cos3xsinxcos2x)dx=xesinxcos xdxesinx(secx tanx)dx=[xesinxesinxdx][esinxsec xesinxdx]=esinx(xsecx)+C

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