− a 4 z 10 + 2 a 6 z 8 − 8 a 4 z 8 + a 2 z 8 − a 8 z 6 + 13 a 6 z 6 − 25 a 4 z 6 + 6 a 2 z 6 − 5 a 8 z 4 + 30 a 6 z 4 − 38 a 4 z 4 + 12 a 2 z 4 − 8 a 8 z 2 + 30 a 6 z 2 − 27 a 4 z 2 + 10 a 2 z 2 − 5 a 8 + 11 a 6 − 8 a 4 + 3 a 2 {\displaystyle -a^{4}z^{10}+2a^{6}z^{8}-8a^{4}z^{8}+a^{2}z^{8}-a^{8}z^{6}+13a^{6}z^{6}-25a^{4}z^{6}+6a^{2}z^{6}-5a^{8}z^{4}+30a^{6}z^{4}-38a^{4}z^{4}+12a^{2}z^{4}-8a^{8}z^{2}+30a^{6}z^{2}-27a^{4}z^{2}+10a^{2}z^{2}-5a^{8}+11a^{6}-8a^{4}+3a^{2}}