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Mathematics 21 Online
OpenStudy (anonymous):

\[4\sum_{k=0}^{\infty}(-1)^{k}/2k+1\]

OpenStudy (anonymous):

hmmmm

OpenStudy (anonymous):

\[\pi?\]

OpenStudy (anonymous):

you would be correct

OpenStudy (anonymous):

series for \[\tan^{-1}(1)\]

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