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## Homework Statement

integrate dx / (x^2 - 1)^2

## Homework Equations

## The Attempt at a Solution

There is nothing i can substitute to get rid of x. Except x=sqr(t), but then dx is 1/2sqr(t) so i get:

∫( dt / (t-1)^2 * 2sqr(t) )

and it's still impossible to integrate.