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Newton\'s formula

Posted by haifeng on 2011-06-21 18:11:36 last update 2011-06-21 18:11:36 | Edit | Answers (0)

\[ 1+\frac{1}{3}-\frac{1}{5}-\frac{1}{7}+\frac{1}{9}+\frac{1}{11}-\frac{1}{13}-\frac{1}{15}+\cdots=\frac{\pi}{2\sqrt{2}} \]