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Prove that (2tan^2 (30^@))/(1-tan^2(30^@...

Prove that `(2tan^2 (30^@))/(1-tan^2(30^@))+sec^2(45^@)-cot^2(45^@) = sec(60^@)`.

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UNITED BOOK HOUSE-ANISHMALI UNTIED ACADEMY-EXERCISE
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