find the product (a+d)and(a^-ab+b^)
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(a+b) × (a² - ab + b²)
a(a² - ab + b²) + b(a² -ab + b²)
a³ - a²b + ab² + a²b - ab² + b³
a³+b³ - a²b +à²b +ab² - ab²
=a³+b³
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