factorize m-m^3-n+n^3
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Answer:
=m - n -(m^3 - n^3)
=(m - n) -(m - n) (m^2 + mn + n^2 )
=(m -n) (1 - m^2 + mn + n^2)
= - (m - n) (m^2 + mn + n^2) +1
=-1(m^3 - n^3)
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