Constant std::f64::consts::FRAC_2_PI

pub const FRAC_2_PI: f64 = 0.636619772367581343075535053490057448f64; // 0.63661977236758138f64

2/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/f64/consts/constant.FRAC_2_PI.html