Geom.Vec3.cos_angle: def of bend-prot@0.1.0.0
Import: import bend-prot@0.1.0.0/geom.bend as Geom
Lines 63-65 of bend-prot@0.1.0.0/geom.bend: https://jend.leeeet.dev/read.txt?path=bend-prot@0.1.0.0/geom.bend&start_line=63&end_line=65

import Base

# Cosine of the angle between a and b. Undefined for zero vectors.
def Vec3.cos_angle(+a: Vec3, +b: Vec3) -> F32:
  (Vec3.dot(a, b) / F32.sqrt((Vec3.norm2(a) * Vec3.norm2(b) : F32)) : F32)

Uses (7):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32.div
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32.mul
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32.sqrt
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/geom.bend&name=Vec3
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/geom.bend&name=Vec3.dot
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/geom.bend&name=Vec3.norm2