q − 2 q + 2 q 3 / 2 − 4 q 5 / 2 + 4 q 7 / 2 − 5 q 9 / 2 + 5 q 11 / 2 − 5 q 13 / 2 + 4 q 15 / 2 − 3 q 17 / 2 + 2 q 19 / 2 − 1 q 21 / 2 {\displaystyle {\sqrt {q}}-{\frac {2}{\sqrt {q}}}+{\frac {2}{q^{3/2}}}-{\frac {4}{q^{5/2}}}+{\frac {4}{q^{7/2}}}-{\frac {5}{q^{9/2}}}+{\frac {5}{q^{11/2}}}-{\frac {5}{q^{13/2}}}+{\frac {4}{q^{15/2}}}-{\frac {3}{q^{17/2}}}+{\frac {2}{q^{19/2}}}-{\frac {1}{q^{21/2}}}}
