/ ___\ / ___\ / ___\ / ___\ | 4*\/ 5 | | 4*\/ 5 | | 4*I*\/ 5 | | 4*I*\/ 5 | 1*|a + -------|*|a - -------|*|a + ---------|*|a - ---------| \ 5 / \ 5 / \ 5 / \ 5 /
(((1*(a + 4*sqrt(5)/5))*(a - 4*sqrt(5)/5))*(a + 4*i*sqrt(5)/5))*(a - 4*i*sqrt(5)/5)
4 -256 + 25*a ------------ 100
(-256 + 25*a^4)/100
/ 2\ / 2\ \-16 + 5*a /*\16 + 5*a / ------------------------ 100
(-16 + 5*a^2)*(16 + 5*a^2)/100
4 -256 + 25*a ------------ 100
(-256 + 25*a^4)/100