− a 4 z 10 + a 6 z 8 − 7 a 4 z 8 + 2 a 2 z 8 + 5 a 6 z 6 − 20 a 4 z 6 + 11 a 2 z 6 − z 6 + 9 a 6 z 4 − 29 a 4 z 4 + 22 a 2 z 4 − 4 z 4 + 7 a 6 z 2 − 20 a 4 z 2 + 20 a 2 z 2 − 5 z 2 + a 6 − 5 a 4 + 7 a 2 − 2 {\displaystyle -a^{4}z^{10}+a^{6}z^{8}-7a^{4}z^{8}+2a^{2}z^{8}+5a^{6}z^{6}-20a^{4}z^{6}+11a^{2}z^{6}-z^{6}+9a^{6}z^{4}-29a^{4}z^{4}+22a^{2}z^{4}-4z^{4}+7a^{6}z^{2}-20a^{4}z^{2}+20a^{2}z^{2}-5z^{2}+a^{6}-5a^{4}+7a^{2}-2}
