\(120^\circ\) or \(\frac{2\pi}{3}\)
The general form of the cosine function is \(f(x)=Acos(Bx-C)+D\),
where the period is \(\frac{2\pi}{B}\). That makes the period of the given function
\(\frac{2\pi}{3}\), or, in degrees, \(120^\circ\).
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