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

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

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Prove that: (cos2A)/(1+sin2A) = tan(pi/4-A)

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(1 + sin2A) / (cos2A) = (cos A + sin A) / (cos A-sin A) = tan ((pi) / (4) +1)