1 / | | 1 | 1*------------- dx | ___ | (1 + x)*\/ x | / 0
/ | | 1 / ___\ | 1*------------- dx = C + 2*atan\\/ x / | ___ | (1 + x)*\/ x | /
pi -- 2
=
1.57079632612502
Use the examples entering the upper and lower limits of integration.