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सर्वसमिका cosec^(2) A = 1 + cot^(2)A को ...

सर्वसमिका `cosec^(2) A = 1 + cot^(2)`A को लागू करके सिद्ध कीजिए कि
`(cos A - sin A + 1)/( cos A + sin A -1) = cosec A + cot A`

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