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Prove that (tan^(2)2theta-tan^(2)theta)/...

Prove that `(tan^(2)2theta-tan^(2)theta)/(1-tan^(2)2thetatan^(2)theta)=tan 3 theta tan theta`.

A

`tan 3 theta // tan theta`

B

` cot 3 theta // cot theta`

C

` tan 3 theta tan theta `

D

`cot 3 theta cot theta`

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The correct Answer is:
C
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