pub const FRAC_PI_4: f64 = 0.785398163397448309615660845819875721f64; // 0.78539816339744828f64
π/4
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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_PI_4.html