pub const FRAC_PI_4: f64 = 0.785398163397448309615660845819875721f64
π/4
© 2010 The Rust Project Developers
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