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सर्वसमिकाओ को सिद्ध करो : cot ^(2) A cos...

सर्वसमिकाओ को सिद्ध करो : `cot ^(2) A cosec ^(2) B-cot ^(2)B cosec ^(2) A=cot ^(2)A -cot ^(2) B`

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