z 4 a 10 + 2 z 2 a 10 − z 6 a 8 − 2 z 4 a 8 + z 2 a 8 + 2 a 8 − 2 z 6 a 6 − 8 z 4 a 6 − 11 z 2 a 6 − 6 a 6 + 3 z 4 a 4 + 9 z 2 a 4 + 5 a 4 {\displaystyle z^{4}a^{10}+2z^{2}a^{10}-z^{6}a^{8}-2z^{4}a^{8}+z^{2}a^{8}+2a^{8}-2z^{6}a^{6}-8z^{4}a^{6}-11z^{2}a^{6}-6a^{6}+3z^{4}a^{4}+9z^{2}a^{4}+5a^{4}}
