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11+= 2secA1+ sinA 1 - sin A |
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Answer» L.H.S. 1+sinAcosA+cosA1+sinA =cosA(1+sinA)COS2A+(1+sinA)2 =cosA(1+sinA)cos2A+1+sin2A+2sinA =cosA(1+sinA)2+2sinA =cosA2=2secA = R.H.S. |
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