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Let $x,y,z$ be different real numbers . Prove that: $$\frac{x^2y^2+1}{(x-y)^2}+\frac{y^2z^2+1}{(y-z)^2}+\frac{z^2x^2+1}{(x-z)^2} \geq \frac{3}{2}$$

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    Maybe you think a=x,b=y,c=z2012-12-16
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    sorry i 've check2012-12-16
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    I find the min happen when $z=0$ and $x=-y$2012-12-16

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