Constant std::f64::consts::FRAC_1_SQRT_PI

pub const FRAC_1_SQRT_PI: f64 = 0.564189583547756286948079451560772586_f64; // 0.56418958354775628f64

🔬This is a nightly-only experimental API. (more_float_constants #103883)

1/sqrt(π)