acot(x) 4
acot(x) -4 *log(4) ----------------- 2 1 + x
acot(x) 4 *(2*x + log(4))*log(4) ------------------------------ 2 / 2\ \1 + x /
/ 2 2 \ acot(x) | log (4) 8*x 6*x*log(4)| 4 *|2 - ------- - ------ - ----------|*log(4) | 2 2 2 | \ 1 + x 1 + x 1 + x / --------------------------------------------------- 2 / 2\ \1 + x /