code: def dot(a, b):
      return a[0] * b[0] + a[1] * b[1] + a[2] * b[2]
  
file_path: sympy/sympy/plotting/pygletplot/plot_rotation.py
imports: import pyglet.gl
  from math import sqrt, acos
label_desc: Use image node_id 2 for calling a global function with example usage: dot(a, b) and returns: unknown