# Primitive function

1. May 2, 2005

### kidia

Please any idea on this,find the primitive of arctan x

2. May 2, 2005

### Data

Two ways: Make the substitution u=arctan x, or use integration by parts,

$$\int u \ dv = uv - \int v \ du$$

where dv=dx, u=arctan x (they really work out in the same way anyways).

3. May 2, 2005

### kidia

Yah now I understand it will be the intergral of arctanxdx. thanx.