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Re: Simplifying Jacobian elliptic functions


> Unprotect[Plus]
> JacobiDN[p_, k_]^2 + k_ JacobiSN[p_, k_]^2 := 1
> Protect[Plus]
> 

Thanks for the tip. Why does your suggestion work, but

Unprotect[Minus];
1 -  JacobiSN[p_, m_]^2 := JacobiCN[p, m]^2;
Protect[Minus];

doesn't??

John


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