(SecA + TanA)(1-SinA) = CosA. Prove.
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( SecA +TanA )(1-SinA)
= (1/CosA +SinA/CosA )(1-SinA)
={(1+SinA)/CosA}(1-SinA)
=[(1+SinA).(1-SinA)/CosA]
=[(1)^2 -SinA^2]/CosA
=CosA^2/CosA
=CosA {Proved}
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