Constant FRAC_1_SQRT_2 

pub const FRAC_1_SQRT_2: f128 = 0.707106781186547524400844362104849039284835937688474036588340_f128 /* 0.707106781186547524400844362104848992f128 */;

🔬This is a nightly-only experimental API. (f128 #116909)

1/sqrt(2)