PYTHON:

Write a function named angle_between that takes two arguments, assumed to be vectors represented as 3-tuples, and returns the angle between them (in radians).

Hint: The easy way to do this is to calculate the dot product of the two vectors using your dot function, and then take advantage of the alternate dot product expression to solve for the angle

this is my dot function:

def dot(v1,v2): return v1[0] * v2[0] + v1[1] * v2[1] + v1[2] * v2[2]

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