The range of \( f(x)=\frac{1}{3 \cos x+5} \) is
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(1) \( \left[\f...
The range of \( f(x)=\frac{1}{3 \cos x+5} \) is
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W
(1) \( \left[\frac{1}{8}, \frac{1}{2}\right] \)
(2) \( \left(\frac{1}{8}, \frac{1}{2}\right) \)
(3) \( \left(-\infty, \frac{1}{8}\right) \cup\left(\frac{1}{2}, \infty\right) \)
(4) \( \left(\frac{1}{8}, \frac{1}{2}\right] \)
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