The range of $f (x) = cos (x / 3)$ is

(- 1 / 3, 1 / 3)

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[- 1, 1]

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(1 / 3, - 1 / 3)

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(- 3, 3)

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Solution

The correct option is B $[- 1, 1]$
Range of cosine function is $[- 1, 1]$
$∴$ range of $f (x) = cos (x / 3)$
$= [- 1, 1]$ [B]

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