Kaushik a minus sign a into sec A minus Cos A
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1. We can write this as,
L.H.S=(1/sina-sina)(1/cosa-cosa)
=> (1-sin^2a/sina)(1-cos^2a/cosa)
=>cos^2a/sina*sin^2a/cosa
=>cosa*sina....
R.H.S=1/sin^2a+cos^2a/cosa*sina
=>so, cosa*sina...
L.H.S=R.H>s
Hence proved!!!.........
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