TBQ - Simplify the rational expression - IV — task. Mathematics CBSE, Class 9 New.

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Simplify the following rational expression assuming that the expressions in the denominators are not equal to zero:

\frac{4 n^{3} - 12 n^{2} m + 12 n m^{2} - 4 m^{3}}{5 m^{2} - 10 mn + 5 n^{2}}

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8. TBQ - Simplify the rational expression - IV