acot(4 - 7*x)
7 -------------- 2 1 + (4 - 7*x)
-98*(-4 + 7*x) ------------------ 2 / 2\ \1 + (-4 + 7*x) /
/ 2 \ | 4*(-4 + 7*x) | 686*|-1 + ---------------| | 2| \ 1 + (-4 + 7*x) / -------------------------- 2 / 2\ \1 + (-4 + 7*x) /