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If f : R rarr R is defined by f(x)=1/(2-...

If `f : R rarr R is defined by f(x)=1/(2-cos3x)` for each `x in R`, then the range of f is

A

(1/3, 1)

B

[1/3, 1]

C

(1,2)

D

[1,2]

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The correct Answer is:
B
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