2 z 2 a 12 + 3 a 12 − z 6 a 10 − 8 z 4 a 10 − 17 z 2 a 10 − 10 a 10 + z 8 a 8 + 8 z 6 a 8 + 21 z 4 a 8 + 22 z 2 a 8 + 8 a 8 {\displaystyle 2z^{2}a^{12}+3a^{12}-z^{6}a^{10}-8z^{4}a^{10}-17z^{2}a^{10}-10a^{10}+z^{8}a^{8}+8z^{6}a^{8}+21z^{4}a^{8}+22z^{2}a^{8}+8a^{8}}
