The @stdlib/math-base-special-ahaversinf package provides a fast, single‑precision implementation of the inverse half‑value versed sine ( ahaversin ), defined as 2·arcsin(√x ). It returns the result in radians for inputs in [0, 1] (and NaN otherwise), and is intended for developers doing numeric or scientific computing in JavaScript/Node.js (or via its C API) who need a reliable, standards‑compliant trigonometric function.
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