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Question

pxp+2q1qxq1x2p+2q+2xp+q+1dx is equal to

A
xpxp+q+1+C
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B
xqxp+q+1+C
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C
xqxp+q+1+C
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D
xpxp+q+1+C
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Solution

The correct option is D xqxp+q+1+C
Let I=pxp+2q1qxq1x2p+2q+2xp+q+1dx
=pxp+2q1qxq1(xp+q+1)2dx
=pxp1qxq1(xp+xq)2dx
Let xp+xq=t
(pxp1qxq1)dx=dt
So ,I=dtt2
=1t+C
=1xp+xq+C
=xqxp+q+1+C

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