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Question

If I=cos1xdx and J=sin1xcos1xsin1x+cos1xdx then J equals to

A
x4I
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B
x+I
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C
x4πI
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D
4π
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Solution

The correct option is B x4πI
J=sin1xcos1xsin1x+cos1xdx

=sin1x+cos1x2cos1xsin1x+cos1xdx

=x2cos1xsin1x+cos1x

Since, sin1x+cos1x=π2

=x2cos1xπ2

=x4πI

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