q 11 / 2 − 4 q 9 / 2 + 9 q 7 / 2 − 15 q 5 / 2 + 18 q 3 / 2 − 21 q + 20 q − 17 q 3 / 2 + 12 q 5 / 2 − 7 q 7 / 2 + 3 q 9 / 2 − 1 q 11 / 2 {\displaystyle q^{11/2}-4q^{9/2}+9q^{7/2}-15q^{5/2}+18q^{3/2}-21{\sqrt {q}}+{\frac {20}{\sqrt {q}}}-{\frac {17}{q^{3/2}}}+{\frac {12}{q^{5/2}}}-{\frac {7}{q^{7/2}}}+{\frac {3}{q^{9/2}}}-{\frac {1}{q^{11/2}}}}
