Prove (a+b+c)^3 - a^3 - b^3 - c^3 = 3(a+b) (b+c) (c+a)

CBSE Class 9 CBSE Class 9 Maths
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Prove (a+b+c)3 - a3 - b3 - c3 = 3(a+b) (b+c) (c+a)

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