Найдите произведение дробей: \(\frac{m^2-1}{m-n}\cdot\frac{2m-2n}{m^2+m}\)
\(\frac{2}{m-n}\)
\(\frac{2m-2}{m}\)
\(\frac{m^2-1+2m-2n}{(m-n)(m^2+m)}\)
\(\frac{m^2-1}{m^2+m}\)
\(\frac{m-n}{m+1}\)