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Math Help - infinite series

  1. #1
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    Joined
    Jan 2009
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    infinite series

    Find the summation of this series :
     \sum_{k=1}^{\infty} \tan^{-1}[ \frac{ y^2 }{ k^2 + x^2 } ]

    Consider  sinx = x \prod_{j=1}^{\infty} [ 1 - \frac{x^2}{(j \pi)^2}]
    Last edited by simplependulum; June 6th 2009 at 08:05 PM.
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