− a 4 z 10 + 2 a 6 z 8 − 6 a 4 z 8 + a 2 z 8 − a 8 z 6 + 9 a 6 z 6 − 15 a 4 z 6 + 4 a 2 z 6 − 3 a 8 z 4 + 14 a 6 z 4 − 19 a 4 z 4 + 6 a 2 z 4 − 2 a 8 z 2 + 8 a 6 z 2 − 10 a 4 z 2 + 5 a 2 z 2 − a 4 + 2 a 2 {\displaystyle -a^{4}z^{10}+2a^{6}z^{8}-6a^{4}z^{8}+a^{2}z^{8}-a^{8}z^{6}+9a^{6}z^{6}-15a^{4}z^{6}+4a^{2}z^{6}-3a^{8}z^{4}+14a^{6}z^{4}-19a^{4}z^{4}+6a^{2}z^{4}-2a^{8}z^{2}+8a^{6}z^{2}-10a^{4}z^{2}+5a^{2}z^{2}-a^{4}+2a^{2}}
