Question

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

Answer 1

Step-by-step explanation:

(x-y)^2+(y-z)^2+(z-x)^2

x^2+y^2-2xy+y^2+z^2-2yz+z^2+x^2-2xz

2x^2+2y^2+2z^2-2xy-2yz-2xz