Posted by sumayya on Monday, June 29, 2009 at 2:26pm.
multiply the left side by sinAcosA/(sinAcosA)
sin^2A*(cosA+sinA)+cos^2A*(sin+cosA)/ ( )
(cosA+sinA)(sin^2+ cos^2)/ ( )
1/sinA + 1/Cos A
cscA + secA
qed
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