Jinc
From specialfunctionswiki
The $\mathrm{jinc}$ function is defined by $$\mathrm{jinc}(z)=\dfrac{J_1(z)}{z},$$ where $J_1$ denotes the Bessel function of the first kind.
Graph of $\mathrm{arccos}$ on $[-1,1]$.
Domain coloring of $\mathrm{jinc}$.
