[RPET 2002]
A) $ (-1/3,\ 1/3) $
B) $ [-1,\ 1] $
C) $ (1/3,\ -1/3) $
D) $ (-3,\ 3) $
Correct Answer: B
$ f(x)=\cos (x/3) $ We know that $ -1\le \cos (x/3)\le 1 $ .
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