− a 4 z 10 + a 6 z 8 − 7 a 4 z 8 + a 2 z 8 + 6 a 6 z 6 − 18 a 4 z 6 + 5 a 2 z 6 − a 8 z 4 + 13 a 6 z 4 − 22 a 4 z 4 + 8 a 2 z 4 − 3 a 8 z 2 + 14 a 6 z 2 − 13 a 4 z 2 + 6 a 2 z 2 − 3 a 8 + 6 a 6 − 4 a 4 + 2 a 2 {\displaystyle -a^{4}z^{10}+a^{6}z^{8}-7a^{4}z^{8}+a^{2}z^{8}+6a^{6}z^{6}-18a^{4}z^{6}+5a^{2}z^{6}-a^{8}z^{4}+13a^{6}z^{4}-22a^{4}z^{4}+8a^{2}z^{4}-3a^{8}z^{2}+14a^{6}z^{2}-13a^{4}z^{2}+6a^{2}z^{2}-3a^{8}+6a^{6}-4a^{4}+2a^{2}}
