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$\displaystyle{}\int \left( x-\frac{x^{2}}{2} + \frac{x^{3}}{3} – \frac{x^{4}}{4}  + \dots \right) dx$ is equal to

  1. $\frac{1}{1+x} + $ Constant
  2. $\frac{1}{1+x^{2}} + $ Constant
  3. $-\frac{1}{1-x} + $ Constant
  4. $-\frac{1}{1-x^{2}} + $ Constant
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