# Math Help - Confused about partial fractions integration

1. ## Confused about integrating partial fractions

2. The ultimate equation should be $1 = \dfrac{A}{x} + \dfrac{B}{x^2} + \dfrac{Cx + D}{x^2 - 1}$.

3. What happened to the 3 in front of x^2(x^2-1)?

4. You factored it out of the integral symbol, so you shouldn't include it in the partial fraction decomposition.

5. Originally Posted by NOX Andrew
The ultimate equation should be $1 = \dfrac{A}{x} + \dfrac{B}{x^2} + \dfrac{Cx + D}{x^2 - 1}$.
$\displaystyle 1 = \frac{A}{x} + \frac{B}{x^2} + \frac{C}{x + 1} + \frac{D}{x - 1}$

-Dan

6. Originally Posted by topsquark
$\displaystyle 1 = \frac{A}{x} + \frac{B}{x^2} + \frac{C}{x + 1} + \frac{D}{x - 1}$

-Dan
Ah that way is much easier to find the variables. Thanks for your help guys.

7. Originally Posted by florx
Has the picture got edited out, or am the only person for whom it does not render?