The domain of \( f(x)=\cos ^{-1}\left(\frac{x}{2}\right) \) is....

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The domain of \( f(x)=\cos ^{-1}\left(\frac{x}{2}\right) \) is
P
(1) \( (-2,2) \)
(2) \( \left(-\frac{1}{2}, \frac{1}{2}\right) \)
(3) \( [-2,2] \)
(4) \( [-1,1] \)


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