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Prove that tan ((pi)/(4) + theta)- tan (...

Prove that tan `((pi)/(4) + theta)- tan ((pi)/(4) - theta) = 2 tan 2 theta`.

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The correct Answer is:
`2 tna 2 theta[ because tan 2 theta = (2 tan theta)/(1 - tan^(2) theta)]`
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