-10*atan(x) + 7*E*x
-10*atan(x) + (7*E)*x
10 - ------ + 7*E 2 1 + x
20*x --------- 2 / 2\ \1 + x /
/ 2 \ | 4*x | 20*|1 - ------| | 2| \ 1 + x / --------------- 2 / 2\ \1 + x /