− a 4 z 10 + 2 a 6 z 8 − 7 a 4 z 8 + 2 a 2 z 8 − a 8 z 6 + 11 a 6 z 6 − 20 a 4 z 6 + 11 a 2 z 6 − z 6 − 4 a 8 z 4 + 21 a 6 z 4 − 28 a 4 z 4 + 20 a 2 z 4 − 4 z 4 − 5 a 8 z 2 + 16 a 6 z 2 − 17 a 4 z 2 + 13 a 2 z 2 − 4 z 2 − 2 a 8 + 4 a 6 − 3 a 4 + 2 a 2 {\displaystyle -a^{4}z^{10}+2a^{6}z^{8}-7a^{4}z^{8}+2a^{2}z^{8}-a^{8}z^{6}+11a^{6}z^{6}-20a^{4}z^{6}+11a^{2}z^{6}-z^{6}-4a^{8}z^{4}+21a^{6}z^{4}-28a^{4}z^{4}+20a^{2}z^{4}-4z^{4}-5a^{8}z^{2}+16a^{6}z^{2}-17a^{4}z^{2}+13a^{2}z^{2}-4z^{2}-2a^{8}+4a^{6}-3a^{4}+2a^{2}}
