Cosine of a scaled vector

What does this NumPy code print?

import numpy as np
a = np.array([1.0, 2.0, 2.0])
b = np.array([2.0, 4.0, 4.0])
sim = a @ b / (np.linalg.norm(a) * np.linalg.norm(b))
print(round(float(sim), 2))