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If xy + yz + zx =1, then (x )/(1-x^(2)...

If `xy + yz + zx =1`, then
`(x )/(1-x^(2)) + ( y )/(1-y^(2)) + ( z )/( 1-z^(2))= ( 4xyz)/( ( 1-x^(2))( 1-y^(2)) ( 1-z^(2)))`

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