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