Constant tracing::stdlib::f128::consts::FRAC_2_SQRT_PI

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pub const FRAC_2_SQRT_PI: f128 = 1.12837916709551257389615890312154517168810125865799771368817_f128; // 1.12837916709551257389615890312154526f128
🔬This is a nightly-only experimental API. (f128 #116909)
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2/sqrt(π)