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If x+y+z=0x+y+z=0 x+y+z=0, simplify
(x−yz+y−zx+z−xy)(zx−y+xy−z+yz−x). \left( \dfrac{x-y}z + \dfrac{y-z}x + \dfrac{z-x}y \right)\left( \dfrac z{x-y} + \dfrac x{y-z} + \dfrac y{z-x} \right). (zx−y+xy−z+yz−x)(x−yz+y−zx+z−xy).
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