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" If "3" cont "A=4" ,chas what "(1)/(1+t...

" If "3" cont "A=4" ,chas what "(1)/(1+tan^(2)A)=cos^(2)A-sin^(2)A" or not "

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

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

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(1 + tan A) / (1-tan A) = (cos2A) / (1-sin2A)