Question

prove that (x+y)^3+(y+z)^3+(z+x)^3-3 (x+y)(y+z)(z+x)=2 (x^3+y^3+z^3-3xyz)

Answer 1

you can prove using identity.

Answer 2

it is very simple Just add the terms using identity and the multiple the them you can prove it try doing it if you have any problem I will surely help you out!
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