If \( 0 \leq x \leq \frac{\pi}{3} \) then range of \( f(x)=\sec \left(\frac{\pi}{6}-x\right) \) ...
If \( 0 \leq x \leq \frac{\pi}{3} \) then range of \( f(x)=\sec \left(\frac{\pi}{6}-x\right) \) \( +\sec \left(\frac{\pi}{6}+x\right) \) is
(a) \( \left(\frac{4}{\sqrt{3}}, \infty\right) \)
(b) \( \left[\frac{4}{\sqrt{3}}, \infty\right) \)
(c) \( \left(0, \frac{4}{\sqrt{3}}\right] \)
(d) \( \left(0, \frac{4}{\sqrt{3}}\right) \)
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