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Question

1cosxcosx(1+cosx)dx.

A
log(secxtanx)2tanx2.
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B
log(secx+tanx)tanx2.
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C
log(secx+tanx)+2tanx2.
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D
log(secx+tanx)2tanx2.
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Solution

The correct option is D log(secx+tanx)2tanx2.
1cosxcosx(1+cosx)=1cosx21+cosx P.F.'S
I=[secx2/2cos2(x/2)]dx
=log(secx+tanx)2tanx2.

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