q 15 / 2 − q 13 / 2 + q 11 / 2 − 2 q 3 / 2 + q − 2 q + 1 q 3 / 2 − 1 q 5 / 2 {\displaystyle q^{15/2}-q^{13/2}+q^{11/2}-2q^{3/2}+{\sqrt {q}}-{\frac {2}{\sqrt {q}}}+{\frac {1}{q^{3/2}}}-{\frac {1}{q^{5/2}}}}
