Constant FRAC_1_PI 

pub const FRAC_1_PI: f128 = 0.318309886183790671537767526745028724068919291480912897495335_f128 /* 0.318309886183790671537767526745028737f128 */;

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

1/π