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सिद्ध कीजिए की: (cos 2A)/( 1-sin 2A) =...

सिद्ध कीजिए की:
`(cos 2A)/( 1-sin 2A) =tan ( 45^(@) +A) `

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(cos A) / (1 + -sin A) = tan (45 ^ (@) + - (A) / (2))

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