cosec A ( 1 + cos A ) ( cosec A - cot A ) = 1
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We have to prove that Cosec A ( 1 + cos A ) ( cosec A - cot A ) = 1
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(cosecA+cosA)×(cosecA-cotA)
(cosecA)×(cosecA) - (cotA)×(cotA)
1/(sinA)2-(cosA)2/(sinA )2
(cosecA)×(cosecA) - (cotA)×(cotA)
1/(sinA)2-(cosA)2/(sinA )2
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