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