\sum_{n=1}^\infty | \frac{(-1)^n}{\sqrt{n}} \left(1+ \frac{(-1)^n}{\sqrt{n}}\right) |\sum_{n=1}^\infty | \frac{(-1)^n}{\sqrt{n}} \left(1+ \frac{(-1)^n}{\sqrt{n}}\right) |

• Natural Language
• Math Input