(sec A-tan A)2 (1 + sin A) = 1 - sin A.
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(sec^2A+tan^2A-2secAtanA)( 1+ sinA)
= (1-2cosA/sinA.sinA.cosA)(1+ sinA)
= (1-2)(1+ sinA)
= (-1)(1+ sinA)
= -(1-sinA) = 0
= 1- sinA = 0
ans is 1-sinA Hence proved.
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