(secA + tanA) (1 - sinA) =
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(^2=square power.)
=SecA=1/CosA
=TanA=SinA/CosA
=1/CosA+SinA/CosA (1-SinA)
=1-SinA/CosA ( 1-SinA )
=1-sin^2A/CosA
=cos^2A/cosA
=CosA hence proved
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