a 2 z 8 + z 8 + 2 a 3 z 7 + 3 a z 7 + z 7 a + 2 a 4 z 6 − 2 a 2 z 6 − 4 z 6 + a 5 z 5 − 6 a 3 z 5 − 11 a z 5 − 4 z 5 a − 6 a 4 z 4 + 2 z 4 a 2 + 8 z 4 − 3 a 5 z 3 + 4 a 3 z 3 + 15 a z 3 + 9 z 3 a + z 3 a 3 + 3 a 4 z 2 + 2 a 2 z 2 − 3 z 2 a 2 − 4 z 2 + a 5 z − a 3 z − 5 a z − 5 z a − 2 z a 3 − a 4 − a 2 + 1 a 2 + 2 {\displaystyle a^{2}z^{8}+z^{8}+2a^{3}z^{7}+3az^{7}+{\frac {z^{7}}{a}}+2a^{4}z^{6}-2a^{2}z^{6}-4z^{6}+a^{5}z^{5}-6a^{3}z^{5}-11az^{5}-{\frac {4z^{5}}{a}}-6a^{4}z^{4}+{\frac {2z^{4}}{a^{2}}}+8z^{4}-3a^{5}z^{3}+4a^{3}z^{3}+15az^{3}+{\frac {9z^{3}}{a}}+{\frac {z^{3}}{a^{3}}}+3a^{4}z^{2}+2a^{2}z^{2}-{\frac {3z^{2}}{a^{2}}}-4z^{2}+a^{5}z-a^{3}z-5az-{\frac {5z}{a}}-{\frac {2z}{a^{3}}}-a^{4}-a^{2}+{\frac {1}{a^{2}}}+2}
