simplify (a+b+c+) (a+b-c)
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a^3+b^3+3ab is the right answer
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(a+b+c) (a+b-c)
a(a+b-c) + b(a+b-c) + c(a+b-c)
a²+ ab - ac + ab + b² - bc + ac + bc - c²
a² + b² - c² + 2ab
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