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" If "sin A=4" ,check wheuher "(1-tan^(2...

" If "sin A=4" ,check wheuher "(1-tan^(2)A)/(1+tan^(2)A)=cos^(2)A-sin^(2)A" or not."

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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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Prove: (1+tan^(2)A)+(1+(1)/(tan^(2)A))=(1)/(sin^(2)A-sin^(4)A)