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Question

Show that
tan3xtan2xtanx=tan3xtan2xtanx

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Solution

We have,
tan3x=tan(2x+x)
or, tan3x=tan2x+tanx1tan2x.tanx
or, tan3xtan3x.tan2x.tanx=tan2x+tanx
or, tan3xtan2xtanx=tan3x.tan2x.tanx.

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