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सिद्ध कीजिए की: (cot A +cosec A -1)/(...

सिद्ध कीजिए की:
` (cot A +cosec A -1)/( cot A - cosec A +1) =cosec A + cot A `

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What is (cot A - "cosec"A -1)/(cot A -"cosec"A +1) equal to?

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