How to integrate $\frac{x^2}{1-x^2}$ I want to integrate 
\[\frac{x^2}{1-x^2},\]
what I have try is trigonometric substitution and partition function and integration by part 
but still cannot solve it
Thx for your reading!

$$\frac{x^2}{1-x^2} = -\frac{x^2}{x^2 - 1} = -\frac{x^2 - 1 + 1}{x^2 - 1} = -1 - \frac{1}{x^2 - 1}$$
Can you take it from here?
