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Jacobi Elliptic Function nd(u,k)

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Calculates the Jacobi elliptic function nd(u,k).
u 
k 
-1≦k≦1
\(\normalsize Jacobi\ elliptic\ function\ nd(u,k)\\ (1)\ nd(u,k)={\large \frac{1}{dn(u,k)}}={\large\frac{1}{\sqrt{1-k^2 \sin^2(am(u,k))}}}\\ (2)\ am(u,k)=\phi=F^{-1}(u,k)\\ \hspace{25px} u=F(\phi,k)={\large\int_{\small 0}^{\phi}\frac{d\theta}{\sqrt{1-k^2 \sin^2\theta}}}\\ (3)\ sn^2(u,k)+cn^2(u,k)=1\\\)

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