Class 11MathematicsTrigonometric FunctionsFundamental trigonometrical ratios and functions, Trigonometrical ratio of allied angles
MediumThe range of $f(x) = \cos (x/3)$ is
- A$(-1/3, 1/3)$
- B$[-1, 1]$
- C$(1/3, -1/3)$
- D$(-3, 3)$
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