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Question

Solve: tanxtan2xtan3xdx.

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Solution

tanxtan2xtan3xdx.
We know tan(2x+x)=tanx+tan2x1tanxtan2x
tan(3x)tanxtan2xtan3x=tanx+tan2x
tanxtan2xtan3x=tan3xtanxtan2x
tanxtan2xtan3x=tan3xtan2xtanxdx
13ln|sec3x|+12ln|sec2x|+ln|secx|+C.

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