(sec A + tan A) (1 - sin A) = Cos A
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(sec A+tan A) (1 -sin A)
=[{ (1/cos A) +(sin A/cos A) } (1- sin A) ]
=[ (1+sin A)/cos A) (1 -sin A) ]
=[ ( 1- sin ^2 A ) /cos A]
= cos^2 A /cos A [ 1-sin^2 A = cos ^2 A)
= cos A
=[{ (1/cos A) +(sin A/cos A) } (1- sin A) ]
=[ (1+sin A)/cos A) (1 -sin A) ]
=[ ( 1- sin ^2 A ) /cos A]
= cos^2 A /cos A [ 1-sin^2 A = cos ^2 A)
= cos A
Khushi10on10:
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