# Math Help - Improper Integral

1. ## Improper Integral

integrate (0 to infinity) 1/((x+1)(x^2+1))..so i
wrote

limit as A approaches infinity int (0 to A) (1/((x+1)(x^2+1))

I tried integrating by using variables A and B so that they have a common denominator...I ve made no progress for a while now plz help

2. $\frac{1}{(x+1)(x^2+1)} = \frac{A}{(x+1)} + \frac{Bx+C}{x^2+1}$

find A,B,C

$\frac{1}{(x+1)(x^2+1)} = \frac{1/2}{x+1} + \frac{-1/2x+1/2}{x^2+1}$