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Q: D[EllipticK[k],k] ?

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  • Subject: [mg1999] Q: D[EllipticK[k],k] ?
  • From: "David O. Gunter" <david_gunter at>
  • Date: Wed, 6 Sep 1995 23:51:13 -0400
  • Organization: Argonne National Laboratory

I need to know if it's possible to obtain the derivative of the
complete elliptic integral given by EllipticK[k], where k is some
parameter.  I've tried
   D[EllipticK[k], k]
with the output result
and when I try
   N[%] /. x->0.5
I get

How can I obtain the numerical answer this derivative?

Thanks in advance.

-david gunter

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