I have been working on this integration problem for awhile now and am completely stuck:(adsbygoogle = window.adsbygoogle || []).push({});

Integral of tanx*tan2x*tan3x

I know I am suppose to use substituion and for that matter probably multiple substitions. But I am no sure what I should use for my first value of "u". I have changed the problem to be in terms of sin and cos, but I am still just ending up at a dead end. If some one can help me start off in the right step I would greatly appreciatte it. I DO NOT want the answer, I would like to solve it for myself, I just need help starting it off right. Thanks in advance.

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# Integration tanx*tan2x*tan3x

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