त्रिकोणमितीय सर्वसमिकाओं को सिद्ध करो : ...

त्रिकोणमितीय सर्वसमिकाओं को सिद्ध करो :
`(cosec A )/(cosec A-1)+(cosec A)/(cosec A+1)=2 sec ^(2) A `

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