Return angle between vectors. If directed is False, the input vectors are interpreted as undirected axes, i.e. the maximum angle is pi/2. >>> a = angle_between_vectors([1, -2, 3], [-1, 2, -3]) >>> numpy.allclose(a, math.pi) True >>> a = angle_between_vectors([1, -2, 3], [-1
(v0, v1, directed=True, axis=0)
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