How to find the summation S= sigma (x_n)^-2 where x_n are the positive roots of tanx=x ???

Des that have to do with the Weierstrass product ??

I am trying to find a differential equation where it's eigenvalues are x_n ????????

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- Apr 13th 2012, 05:08 PMhgd7833A problem in complex analysis
How to find the summation S= sigma (x_n)^-2 where x_n are the positive roots of tanx=x ???

Des that have to do with the Weierstrass product ??

I am trying to find a differential equation where it's eigenvalues are x_n ????????