The minimum value of \( 27^{\cos 3 x} \cdot 81^{\sin 3 x} \) is (IV...

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The minimum value of \( 27^{\cos 3 x} \cdot 81^{\sin 3 x} \) is
(IV)
(a) 1
(b) \( \frac{1}{81} \)
(c) \( \frac{1}{243} \)
(d) \( \frac{1}{27} \)
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