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