Помогите  пожалуйста   Упростите выражение:

а) (х + у)^3 + (х - у)^3; в) (m - n)^3 + 3mn(m - n);

б) (х + у)^3 - (х - у)^3; г) 3mn(m + n) - (m + n)^3.
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