Integral de (x^2)/(1-2x-x^2) dx

                               //            /  ___        \                   \                     
                               ||   ___      |\/ 2 *(1 + x)|                   |                     
  /                            ||-\/ 2 *acoth|-------------|                   |                     
 |                             ||            \      2      /              2    |                     
 |       2                     ||----------------------------  for (1 + x)  > 2|                     
 |      x                      ||             2                                |      /      2      \
 | ------------ dx = C - x - 3*|<                                              | + log\-1 + x  + 2*x/
 |            2                ||            /  ___        \                   |                     
 | 1 - 2*x - x                 ||   ___      |\/ 2 *(1 + x)|                   |                     
 |                             ||-\/ 2 *atanh|-------------|                   |                     
/                              ||            \      2      /              2    |                     
                               ||----------------------------  for (1 + x)  < 2|                     
                               \\             2                                /                     

$$\int \frac{x^{2}}{- x^{2} + \left(1 - 2 x\right)}\, dx = C - x - 3 \left(\begin{cases} - \frac{\sqrt{2} \operatorname{acoth}{\left(\frac{\sqrt{2} \left(x + 1\right)}{2} \right)}}{2} & \text{for}\: \left(x + 1\right)^{2} > 2 \\- \frac{\sqrt{2} \operatorname{atanh}{\left(\frac{\sqrt{2} \left(x + 1\right)}{2} \right)}}{2} & \text{for}\: \left(x + 1\right)^{2} < 2 \end{cases}\right) + \log{\left(x^{2} + 2 x - 1 \right)}$$

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