z 6 a 2 + z 6 + 3 a z 5 + 5 z 5 a + 2 z 5 a 3 + 3 a 2 z 4 + 2 z 4 a 2 + z 4 a 4 + 4 z 4 + a 3 z 3 − 3 a z 3 − 8 z 3 a − 4 z 3 a 3 − 3 a 2 z 2 − 6 z 2 a 2 − 2 z 2 a 4 − 7 z 2 + a z + 3 z a + 2 z a 3 + 2 a 2 + 1 a 4 + 2 {\displaystyle {\frac {z^{6}}{a^{2}}}+z^{6}+3az^{5}+{\frac {5z^{5}}{a}}+{\frac {2z^{5}}{a^{3}}}+3a^{2}z^{4}+{\frac {2z^{4}}{a^{2}}}+{\frac {z^{4}}{a^{4}}}+4z^{4}+a^{3}z^{3}-3az^{3}-{\frac {8z^{3}}{a}}-{\frac {4z^{3}}{a^{3}}}-3a^{2}z^{2}-{\frac {6z^{2}}{a^{2}}}-{\frac {2z^{2}}{a^{4}}}-7z^{2}+az+{\frac {3z}{a}}+{\frac {2z}{a^{3}}}+{\frac {2}{a^{2}}}+{\frac {1}{a^{4}}}+2}
