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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)) = ( 1)/( [ ( 1+x^(2)) ( 1+ y^(2) ) ( 1+ z^(2))]^(1//2))`

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