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Question

Integrate the following functions.
tanxsinx.cosxdx.

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Solution

tanxsinx.cosxdx=tanxsinxcosx×cosxcosxdx
[Multiply by 1=cosxcosx in denominator]
=tanxtanx.cos2xdx=tanxtanx.sec2xdx
Let tanx=tsec2x=dtdxdx=dtsec2x
tanxtanx.sec2xdx=tt.sec2xdtsec2x=1tdt=t12dt=t12+1(12+1)+C=2t+C=2tanx+C


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