− a 2 z 8 + 2 a 4 z 6 − 5 a 2 z 6 + z 6 − a 6 z 4 + 8 a 4 z 4 − 10 a 2 z 4 + 3 z 4 − 3 a 6 z 2 + 11 a 4 z 2 − 10 a 2 z 2 + 3 z 2 − 2 a 6 + 5 a 4 − 4 a 2 + 2 {\displaystyle -a^{2}z^{8}+2a^{4}z^{6}-5a^{2}z^{6}+z^{6}-a^{6}z^{4}+8a^{4}z^{4}-10a^{2}z^{4}+3z^{4}-3a^{6}z^{2}+11a^{4}z^{2}-10a^{2}z^{2}+3z^{2}-2a^{6}+5a^{4}-4a^{2}+2}
