pub const FRAC_PI_2: f64 = 1.57079632679489661923132169163975144f64; // 1.5707963267948966f64
π/2
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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_2.html