Question

(a+b)³ -a-b.,.........​

Answer 1

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

(a+ b)^3 = a^3+b^3+3a^2b+3ab^2

now (a+b)^3-a-b = a^3+b^3+3a^2b+3ab^2-a-b

a(a^2-1)+b(b^2-1) + 3a^2b + 3ab^2