Question

prove that

(x-y)(x+y)+(y-z)(y+z)+(z-x)(z+x)=0

pls pls pls pls pls answer this question.....​

Answer 1

Apply this Formula

(a+b)(a-b)=a^2-b^2

so

(x^2-y^2)+(y^2-z^2)+(z^2-x^2)=0

so all are cancelled

0=0