− q 13 / 2 + 4 q 11 / 2 − 9 q 9 / 2 + 15 q 7 / 2 − 21 q 5 / 2 + 24 q 3 / 2 − 25 q + 21 q − 16 q 3 / 2 + 10 q 5 / 2 − 5 q 7 / 2 + 1 q 9 / 2 {\displaystyle -q^{13/2}+4q^{11/2}-9q^{9/2}+15q^{7/2}-21q^{5/2}+24q^{3/2}-25{\sqrt {q}}+{\frac {21}{\sqrt {q}}}-{\frac {16}{q^{3/2}}}+{\frac {10}{q^{5/2}}}-{\frac {5}{q^{7/2}}}+{\frac {1}{q^{9/2}}}}
