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If 3 cot A = 4 , check whether ...

If ` 3 cot A = 4 , ` check whether ` (1 - tan ^ 2 A ) /( 1 + tan ^ 2 A ) = cos ^ 2 A - sin ^ 2 A ` or not

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The correct Answer is:
Yes, `(1-tan^(2)A)/(1+tan^(2)A)=cos^(2)A-sin^(2)A`.
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