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(1+ sin A- cos A)/( 1+ sin A + cos A)=...

`(1+ sin A- cos A)/( 1+ sin A + cos A)=`

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Prove that (1 + sin x-cos x) / (1 + sin x + cos x) + (1 + sin x + cos x) / (1 + sin x-cos x) = 2cos ecx

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Prove that (sin A + 1-cos A) / (sin A-1 + cos A) = (1 + sin A) / (cos A)

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