− q 13 / 2 + 4 q 11 / 2 − 8 q 9 / 2 + 12 q 7 / 2 − 15 q 5 / 2 + 16 q 3 / 2 − 16 q + 11 q − 8 q 3 / 2 + 4 q 5 / 2 − 1 q 7 / 2 {\displaystyle -q^{13/2}+4q^{11/2}-8q^{9/2}+12q^{7/2}-15q^{5/2}+16q^{3/2}-16{\sqrt {q}}+{\frac {11}{\sqrt {q}}}-{\frac {8}{q^{3/2}}}+{\frac {4}{q^{5/2}}}-{\frac {1}{q^{7/2}}}}