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त्रिकोणमितीय सर्वसमिकाओं को सिद्ध करो : ...

त्रिकोणमितीय सर्वसमिकाओं को सिद्ध करो :
`(cos theta)/(cosec theta+1)+(cos theta)/(cosec theta-1)=2 tan theta`

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