a 8 ( − z 4 ) − 4 a 8 z 2 − 3 a 8 + a 6 z 6 + 6 a 6 z 4 + 10 a 6 z 2 + 4 a 6 {\displaystyle a^{8}\left(-z^{4}\right)-4a^{8}z^{2}-3a^{8}+a^{6}z^{6}+6a^{6}z^{4}+10a^{6}z^{2}+4a^{6}}
