− q 7 / 2 + 5 q 5 / 2 − 13 q 3 / 2 + 18 q − 25 q + 25 q 3 / 2 − 27 q 5 / 2 + 20 q 7 / 2 − 15 q 9 / 2 + 7 q 11 / 2 − 3 q 13 / 2 + 1 q 15 / 2 {\displaystyle -q^{7/2}+5q^{5/2}-13q^{3/2}+18{\sqrt {q}}-{\frac {25}{\sqrt {q}}}+{\frac {25}{q^{3/2}}}-{\frac {27}{q^{5/2}}}+{\frac {20}{q^{7/2}}}-{\frac {15}{q^{9/2}}}+{\frac {7}{q^{11/2}}}-{\frac {3}{q^{13/2}}}+{\frac {1}{q^{15/2}}}}
