1.

(x – y)(x + y) + (y – z)(y + z) + (z – x) (z + x) is equal to​

Answer»

(X – y)(x + y) + (y – z)(y + z) + (z – x) (z + x)

x²+xy-xy-y²+y²+yz-yz-z²+z²+xz-xz-z²

* everything will get canceled *

so, 1 WOULD be the ANSWER

HOPE this would help

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