− q 21 / 2 + 3 q 19 / 2 − 4 q 17 / 2 + 6 q 15 / 2 − 7 q 13 / 2 + 8 q 11 / 2 − 8 q 9 / 2 + 6 q 7 / 2 − 6 q 5 / 2 + 3 q 3 / 2 − 3 q + 1 q {\displaystyle -q^{21/2}+3q^{19/2}-4q^{17/2}+6q^{15/2}-7q^{13/2}+8q^{11/2}-8q^{9/2}+6q^{7/2}-6q^{5/2}+3q^{3/2}-3{\sqrt {q}}+{\frac {1}{\sqrt {q}}}}
