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Prove that (1+ tan^4 theta)/(1+ tan^2 th...

Prove that `(1+ tan^4 theta)/(1+ tan^2 theta) = sec ^2 theta-2 sin^2theta`

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OSWAL PUBLICATION-INTRODUCTION TO TRIGONOMETRY AND TRIGONOMETRIC IDENTITIES -SELF ASSESSMENT - 2 (I. Objective Type Questions)(II. Short Answer Type Questions - I)
  1. Express the trigonometric ratio of sec A and tan A in terms of sin A.

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  2. sqrt((1+sin A)/(1-sin A))=sec A+tan A

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  3. Prove that (1+ tan^4 theta)/(1+ tan^2 theta) = sec ^2 theta-2 sin^2the...

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