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यदि 3 cotA=4, तो जाँच कीजिए कि (1-tan^...

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

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