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

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If 3 cot A = 4, check whether \(\frac{1-tan^2A}{1+tan^2A}\) = \(cos^2 A\) - \(sin^2A\) or not.

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thus, it is true.

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