− a 4 z 10 + 2 a 6 z 8 − 7 a 4 z 8 + a 2 z 8 − a 8 z 6 + 12 a 6 z 6 − 20 a 4 z 6 + 5 a 2 z 6 − 5 a 8 z 4 + 27 a 6 z 4 − 30 a 4 z 4 + 9 a 2 z 4 − 8 a 8 z 2 + 28 a 6 z 2 − 22 a 4 z 2 + 8 a 2 z 2 − 5 a 8 + 10 a 6 − 6 a 4 + 2 a 2 {\displaystyle -a^{4}z^{10}+2a^{6}z^{8}-7a^{4}z^{8}+a^{2}z^{8}-a^{8}z^{6}+12a^{6}z^{6}-20a^{4}z^{6}+5a^{2}z^{6}-5a^{8}z^{4}+27a^{6}z^{4}-30a^{4}z^{4}+9a^{2}z^{4}-8a^{8}z^{2}+28a^{6}z^{2}-22a^{4}z^{2}+8a^{2}z^{2}-5a^{8}+10a^{6}-6a^{4}+2a^{2}}
