q 21 / 2 − 3 q 19 / 2 + 5 q 17 / 2 − 7 q 15 / 2 + 9 q 13 / 2 − 10 q 11 / 2 + 10 q 9 / 2 − 8 q 7 / 2 + 5 q 5 / 2 − 4 q 3 / 2 + q − 1 q {\displaystyle q^{21/2}-3q^{19/2}+5q^{17/2}-7q^{15/2}+9q^{13/2}-10q^{11/2}+10q^{9/2}-8q^{7/2}+5q^{5/2}-4q^{3/2}+{\sqrt {q}}-{\frac {1}{\sqrt {q}}}}
