pub const FRAC_1_SQRT_2PI: f64 = 0.398942280401432677939946059934381868_f64; // 0.3989422804014327f64
more_float_constants #146939)
1/sqrt(2π)
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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/f64/consts/constant.FRAC_1_SQRT_2PI.html