Function calcify::degrees_between
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Return the angle between two vectors in degrees
Example
use std::f64;
use calcify::ThreeVec;
use calcify::degrees_between;
let vec1 = ThreeVec::new(1.0,0.0,0.0);
let vec2 = ThreeVec::new(0.0,1.0,0.0);
assert_eq!(degrees_between(vec1,vec2),90.0);