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