prove that (a+b)³+(b+c)³+(c+a)³-3(a+b)(b+c)(c+a)=2(a³+b³c³-3abc)

1.	prove that (a+b)³+(b+c)³+(c+a)³-3(a+b)(b+c)(c+a)=2(a³+b³c³-3abc)
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