Question: The integration of Jacobi elliptic functions

Hello everybody.

I'd like to share an observation about the integration of the Jacobi elliptic functions, in particularly the elliptic sine sn(x,k).

It's correct answer. But when I make the integration of the expression

 

according to the Handbook of Elliptic Integrals for Engineers and Scientists we have slightly another result

What is the difference?

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