/ 2 2\ acot(x) log\x + a / ------- + ------------ a 2
acot(x)/a + log(x^2 + a^2)/2
2 1 2*x 2*x ------- - ---------- + ----------- 2 2 2 2 a + x / 2 2\ / 2\ \a + x / a*\1 + x /
/ 3 2 \ | 1 3*x 4*x 4*x | 2*|----------- - ---------- + ---------- - -----------| | 2 2 3 3| | / 2\ / 2 2\ / 2 2\ / 2\ | \a*\1 + x / \a + x / \a + x / a*\1 + x / /