verify if the relationship is true? (a+b)^5-a^5-b^5=5ab(a+b)(a^2+ab+b^2)

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We have to verify if (a+b)^5 - a^5 - b^5 = 5ab(a+b)(a^2+ab+b^2)

We can expand (a + b)^5 = a^5 + 5a^4b + 10 a^3b^2 + 10 a^2b^3 + 5ab^4 + b^5

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