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यदि 3 cot A = 4 , तो जाँच कीजिए कि (1 - ...

यदि 3 cot A = 4 , 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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