Bonded.angle_e: def of bend-prot@0.1.0.0
Import: import bend-prot@0.1.0.0/bonded.bend as Bonded
Lines 89-91 of bend-prot@0.1.0.0/bonded.bend: https://jend.leeeet.dev/read.txt?path=bend-prot@0.1.0.0/bonded.bend&start_line=89&end_line=91

import Base
import bend-prot@0.1.0.0/geom.bend as G
import bend-prot@0.1.0.0/force.bend as F

# Harmonic angle energy k*(theta - eq)^2 about the middle serial.
def angle_e(+pa: G.Vec3, +pb: G.Vec3, +pc: G.Vec3, +k: F32, +eq: F32) -> F32:
  (k * F.lj_sq((G.Vec3.angle(G.Vec3.sub(pa, pb), G.Vec3.sub(pc, pb)) - eq : 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.mul
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32.sub
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/force.bend&name=lj_sq
  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.angle
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/geom.bend&name=Vec3.sub