/ _____________\ / _____________\ / ___________\ / ___________\ | / ___ | | / ___ | | / ___ | | / ___ | | / 1 \/ 7 | | / 1 \/ 7 | | / 1 \/ 7 | | / 1 \/ 7 | |a + I* / - - + ----- |*|a - I* / - - + ----- |*|a + / - + ----- |*|a - / - + ----- | \ \/ 6 6 / \ \/ 6 6 / \ \/ 6 6 / \ \/ 6 6 /
(((a + i*sqrt(-1/6 + sqrt(7)/6))*(a - i*sqrt(-1/6 + sqrt(7)/6)))*(a + sqrt(1/6 + sqrt(7)/6)))*(a - sqrt(1/6 + sqrt(7)/6))