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If $f: R \to R$ and defined by $f(x)=\large\frac{1}{2-\cos 3x}$ for each $ x \in R$, then the range of f is

\[\begin {array} {1 1} (a)\;(1/3,1) & \quad (b)\;[1/3,1] \\ (c)\;(1,2) & \quad (d)\;[1,2] \end {array}\]

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(b) [1/3,1]
answered Nov 7, 2013 by pady_1

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