Jacobi sc
From specialfunctionswiki
The $\mathrm{sc}$ function is defined by $$\mathrm{sc}(u)=\dfrac{\mathrm{sn}(u)}{\mathrm{cn}(u)},$$ where $\mathrm{sn}$ is the Jacobi sn function and $\mathrm{cn}$ is the Jacobi cn function.
Domain coloring of $\mathrm{sc}$ corresponding to $m=0.8$.
References
Special functions by Leon Hall