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Expansion of (x^2 - y^2)

Solve: m+nm2...

Question

Solve:
$(m + n) (m^{2} - m n - n^{2})$

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Solution

$(m + n) (m^{2} - m n - n^{2}) = m^{3} - m^{2} n - m n^{2} + m^{2} n - m n^{2} - n^{3} = m^{3} - n^{3} - 2 m n^{2}$

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