show that tan3x tan2x tanx=tan3x -tan2x-tanx
Allabaxkhatri:
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Answered by
7
3x = x+2x
so
tan3x = tan(x+2x)
tan3x = tanx+tan2x/1-tanxtan2x
tan3x(1-tanxtan2x) = tanx + tan2x
so
tan 3x -tanx-tan2x = tanxtan2xtan3x .
hence proved .
so
tan3x = tan(x+2x)
tan3x = tanx+tan2x/1-tanxtan2x
tan3x(1-tanxtan2x) = tanx + tan2x
so
tan 3x -tanx-tan2x = tanxtan2xtan3x .
hence proved .
Answered by
2
You can prove it as on pg
Attachments:
one mistake in last step ;/
hogi ib
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