General simplification
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$$m^{2} - m - n^{2} + n$$
$$\left(m - n\right) \left(m + \left(n - 1\right)\right)$$
$$\left(m - n\right) \left(m + n - 1\right)$$
$$m^{2} - m - n^{2} + n$$
Assemble expression
[src]
$$m^{2} - m - n^{2} + n$$
$$m^{2} - m - n^{2} + n$$
$$m^{2} - m - n^{2} + n$$
Combining rational expressions
[src]
$$m^{2} - m - n^{2} + n$$
Rational denominator
[src]
$$m^{2} - m - n^{2} + n$$