Question

1 - sinA/cosA = cos A/1 +sinA

Answer 1

( 1 - sin A ) / cos A = cos A / ( 1 + sin A ) is true ,

[ Cross multiply ]

if , ( 1 + sin A )( 1 - sin A ) = cos² A is true ,

if , ( 1 - sin² A ) = cos² A is true ,

if , sin² A + cos² A = 1 is true , which is true

Hence :

( 1 - sin A ) / cos A = cos A / ( 1 + sin A ) is true. [ Proved ]

Hope it helps ya :)

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