log(x) - atan(x)
1 1 - - ------ x 2 1 + x
1 2*x - -- + --------- 2 2 x / 2\ \1 + x /
/ 2 \ |1 1 4*x | 2*|-- + --------- - ---------| | 3 2 3| |x / 2\ / 2\ | \ \1 + x / \1 + x / /