q 4 − 2 q 3 + 3 q 2 − 4 q + 5 − 4 q + 3 q 2 − 2 q 3 + 1 q 4 {\displaystyle q^{4}-2q^{3}+3q^{2}-4q+5-{\frac {4}{q}}+{\frac {3}{q^{2}}}-{\frac {2}{q^{3}}}+{\frac {1}{q^{4}}}}
