[Maxima-bugs] Incorrect derivative of the Jacobi elliptic function

[Ovidius P. N. <ovi...@gm...>]

Hi,

I think the derivative of the Jacobi dn(x,k) elliptic function is
incorrect. Typing

diff(jacobi_dn(x,k),x);

returns with

-k * jacobi_cn(x,k) * jacobi_sn(x,k)

but the pre-factor should be k^2 instead of simply k.

Kind regards,
ovidius