a 2 z 10 − 2 a 4 z 8 + 7 a 2 z 8 − z 8 + a 6 z 6 − 11 a 4 z 6 + 19 a 2 z 6 − 5 z 6 + 4 a 6 z 4 − 21 a 4 z 4 + 24 a 2 z 4 − 8 z 4 + 5 a 6 z 2 − 16 a 4 z 2 + 13 a 2 z 2 − 4 z 2 + 2 a 6 − 4 a 4 + 2 a 2 + 1 {\displaystyle a^{2}z^{10}-2a^{4}z^{8}+7a^{2}z^{8}-z^{8}+a^{6}z^{6}-11a^{4}z^{6}+19a^{2}z^{6}-5z^{6}+4a^{6}z^{4}-21a^{4}z^{4}+24a^{2}z^{4}-8z^{4}+5a^{6}z^{2}-16a^{4}z^{2}+13a^{2}z^{2}-4z^{2}+2a^{6}-4a^{4}+2a^{2}+1}