sin A + sin A is ( 0° < A < 90° ) .1 + cos A1 -

As per given question , we have

sin A	+	sin A
1 + cos A	+	1 - cos A

sin A	+	sin A	=	sin A( 1 - cos A ) + sin A( 1 + cos A )
1 + cos A	+	1 - cos A	=	( 1 + cos A )( 1 - cos A )

=	sin A - sin A cos A + sin A sin A cos A
	1 + cos² A

=	2 sin A	=	2 cosec A
	sin² A

∴	sin A	+	sin A	= 2cosec A
	1 + cos A		1 - cos A