− q 5 / 2 + 2 q 3 / 2 − 2 q + 2 q − 2 q 3 / 2 + 1 q 5 / 2 − 1 q 7 / 2 − 1 q 13 / 2 {\displaystyle -q^{5/2}+2q^{3/2}-2{\sqrt {q}}+{\frac {2}{\sqrt {q}}}-{\frac {2}{q^{3/2}}}+{\frac {1}{q^{5/2}}}-{\frac {1}{q^{7/2}}}-{\frac {1}{q^{13/2}}}}
