z 6 a 6 + z 6 a 8 + 5 z 4 a 6 + 5 z 4 a 8 − z 4 a 10 + 6 z 2 a 6 + 6 z 2 a 8 − 5 z 2 a 10 + 2 a 6 + 2 a 8 − 4 a 10 + 1 a 12 {\displaystyle {\frac {z^{6}}{a^{6}}}+{\frac {z^{6}}{a^{8}}}+{\frac {5z^{4}}{a^{6}}}+{\frac {5z^{4}}{a^{8}}}-{\frac {z^{4}}{a^{10}}}+{\frac {6z^{2}}{a^{6}}}+{\frac {6z^{2}}{a^{8}}}-{\frac {5z^{2}}{a^{10}}}+{\frac {2}{a^{6}}}+{\frac {2}{a^{8}}}-{\frac {4}{a^{10}}}+{\frac {1}{a^{12}}}}
