Question

Please prove it by uploading in the form of a photo please don't prove it by text please please

Answer 1

i prove by text
a-b+b-c +c-a = 0
also consider
a-b be x
b - c be y
c - a be z
we know
x3 +y3+z3 +3xyz = (x+y + x)(x2+ y2 +z2-xy-yz -xz) so if one factor 0 then the product is 0
so x + y + z = 3xyz
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