/ ___\ / ___\ / ___\ / ___\ | \/ 7 | | \/ 7 | | I*\/ 7 | | I*\/ 7 | 1*|a + -----|*|a - -----|*|a + -------|*|a - -------| | 2| | 2| | 2 | | 2 | \ 7*b / \ 7*b / \ 7*b / \ 7*b /
(((1*(a + sqrt(7)/(7*b^2)))*(a - sqrt(7)/(7*b^2)))*(a + i*sqrt(7)/(7*b^2)))*(a - i*sqrt(7)/(7*b^2))
/ 2 4\ / 2 4\ \1 + 7*a *b /*\-1 + 7*a *b /
(1 + 7*a^2*b^4)*(-1 + 7*a^2*b^4)