यदि 3 cot A = A, तो जाँच कीजिए कि (1- ta...

यदि `3 cot A = A`, तो जाँच कीजिए कि `(1- tan^2 A)/(1+ tan^2 A) = cos^2 A - sin^2 A` है या नहीं।

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`cos^2 A - sin^2 A ` है

यदि 3 cot A = A, तो जाँच कीजिए कि (1- tan^2 A)/(1+ tan^2 A) = cos^2 A ...
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