Question

Prove that :
( sec a + tan a ) ( 1 - sin a ) = cos a

Answer 1

Step-by-step explanation:

taking LHS,

change tan a and sec a in sin a and cos a form.

{1+ sina }/cos a ×{ 1-sina }

{1-sin^2 a }/cosa

cos^2a /cos a

cos a = RHS PROVED