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