If tan-1 [ (x2 - y2)/ (x2 + y2) ] = a ; prove that dy/dx = x( 1 - tanA) / y ( 1 + tanA)
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If tan-1 [ (x2 - y2)/ (x2 + y2) ] = a ; prove that dy/dx = x( 1 - tanA) / y ( 1 + tanA)