q 15 / 2 − q 13 / 2 + 2 q 11 / 2 − 2 q 9 / 2 + q 7 / 2 − q 5 / 2 − 2 q + 1 q 3 / 2 − 1 q 5 / 2 {\displaystyle q^{15/2}-q^{13/2}+2q^{11/2}-2q^{9/2}+q^{7/2}-q^{5/2}-{\frac {2}{\sqrt {q}}}+{\frac {1}{q^{3/2}}}-{\frac {1}{q^{5/2}}}}
