q 9 / 2 − 2 q 7 / 2 + 2 q 5 / 2 − 2 q 3 / 2 + q − 1 q + 1 q 5 / 2 − 2 q 7 / 2 + 1 q 9 / 2 − 1 q 11 / 2 {\displaystyle q^{9/2}-2q^{7/2}+2q^{5/2}-2q^{3/2}+{\sqrt {q}}-{\frac {1}{\sqrt {q}}}+{\frac {1}{q^{5/2}}}-{\frac {2}{q^{7/2}}}+{\frac {1}{q^{9/2}}}-{\frac {1}{q^{11/2}}}}
