CauchyWindow
CauchyWindow[x] represents a Cauchy window function of x.
CauchyWindow[x, α] uses the parameter α.
Examples
CauchyWindow[0.5]
(* 0.8 *)Plot[CauchyWindow[x], {x, -1, 1}]
(* Graphics[...] *)Please visit the official Wolfram Language Reference for more details.