Question

(a-b)(a+b)+(b-c)(b+c)+(c-a)(c+a)=0​

Answer 1

(a-b)(a+b)+(b-c)(b+c)+(c-a)(c+a)=0
(a^2-b^2)+(b^2-c^2)+(c^2-a^2)=0
a^2-b^2+b^2-c^2+c^2-a^2=0
0=0
I hope this helps
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