Question

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

Answer 1

Answer:

O is the answer of this question

Step-by-step explanation:

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

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

= 0