Constant FRAC_2_SQRT_PI
pub const FRAC_2_SQRT_PI: f32 = 1.12837916709551257389615890312154517_f32; // 1.12837923f32Expand description
2/sqrt(π)
pub const FRAC_2_SQRT_PI: f32 = 1.12837916709551257389615890312154517_f32; // 1.12837923f322/sqrt(π)