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2014-09-24T13:55:01+02:00
a 3 + 3a²b + 3ab² + b3. (a – b)3. = a 3 – 3a²b + 3ab² – b3. a3 – b3. = (a – b) (a² + ab + b² ). a3 + b3. = (a + b) (a² – ab + b² ).