− q + 3 q − 6 q 3 / 2 + 9 q 5 / 2 − 12 q 7 / 2 + 12 q 9 / 2 − 12 q 11 / 2 + 9 q 13 / 2 − 6 q 15 / 2 + 3 q 17 / 2 − 1 q 19 / 2 {\displaystyle -{\sqrt {q}}+{\frac {3}{\sqrt {q}}}-{\frac {6}{q^{3/2}}}+{\frac {9}{q^{5/2}}}-{\frac {12}{q^{7/2}}}+{\frac {12}{q^{9/2}}}-{\frac {12}{q^{11/2}}}+{\frac {9}{q^{13/2}}}-{\frac {6}{q^{15/2}}}+{\frac {3}{q^{17/2}}}-{\frac {1}{q^{19/2}}}}
