Question

(x-z) (y-z) - (y-x) (x-y)​

Answer 1

(x-z)(y-z) - (y-x)(x-y)

=> xy-xz-yz+z² - (xy-y²-x²+xy)

=> xy-xz-yz+z²-xy+y²+x²-xy

=> x²+y²+z²-xy-yz-zx

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