pub const FRAC_2_SQRT_PI: f32 = 1.12837916709551257389615890312154517f32; // 1.12837923f32
2/sqrt(π)
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Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/f32/consts/constant.FRAC_2_SQRT_PI.html