Constant tracing::stdlib::f64::consts::FRAC_1_SQRT_2PI

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pub const FRAC_1_SQRT_2PI: f64 = 0.398942280401432677939946059934381868_f64; // 0.3989422804014327f64
🔬This is a nightly-only experimental API. (more_float_constants #103883)
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1/sqrt(2π)