− q + 2 q − 4 q 3 / 2 + 3 q 5 / 2 − 5 q 7 / 2 + 4 q 9 / 2 − 3 q 11 / 2 + 2 q 13 / 2 {\displaystyle -{\sqrt {q}}+{\frac {2}{\sqrt {q}}}-{\frac {4}{q^{3/2}}}+{\frac {3}{q^{5/2}}}-{\frac {5}{q^{7/2}}}+{\frac {4}{q^{9/2}}}-{\frac {3}{q^{11/2}}}+{\frac {2}{q^{13/2}}}}
