q 15 / 2 − q 13 / 2 + q 9 / 2 − 2 q 7 / 2 + 2 q 5 / 2 − 4 q 3 / 2 + 3 q − 3 q + 2 q 3 / 2 − 1 q 5 / 2 {\displaystyle q^{15/2}-q^{13/2}+q^{9/2}-2q^{7/2}+2q^{5/2}-4q^{3/2}+3{\sqrt {q}}-{\frac {3}{\sqrt {q}}}+{\frac {2}{q^{3/2}}}-{\frac {1}{q^{5/2}}}}
