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सिद्ध कीजिए ( सर्वसमिका cosec^2 A=1 + co...

सिद्ध कीजिए ( सर्वसमिका `cosec^2 A=1 + cot^2 A` को लागु करके :
`(cosA-sinA+1)/(cosA+sinA-1)=cosecA+cotA`

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