Prove that ( tan 90 = frac { 2 tan 45 } { 1 - tan ^ { 2 } 45 } )

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Prove that dfrac{1+tan^2(45^o-A)}{1-tan^2(45^o-A)}=cosec 2A.

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Ex 8.2, 2 (ii) (MCQ) - 1 - tan^2 45 / 1 + tan^2 45 = [Video Solution]

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Prove that ( tan 90 = frac { 2 tan 45 } { 1 - tan ^ { 2 } 45 } )

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1- tan^(2) (45^(@)-A))/(1+tan^(2)(45^(@)=A)) =sin 2A`

Solved: Prove the following: a. 2sin^2(45°-A)=1-sin 2A b. 2 sin^2(90°-A)=1+cos 2A C. 2cos^2(45°-A) [Math]