Prove that `(a+b+c)^3-a^3-b^3-c^3=3(a+b)(b+c)(c+a)`.
Channel: Doubtnut
Date: 2020-01-03

Prove that `(a+b+c)^3-a^3-b^3-c^3=3(a+b)(b+c)(c+a)`.