If \( 0 \leq x \leq \pi \) and \( 81^{\sin ^{2} x}+81^{\cos ^{2} x}=30 \), then \( x \) is equal...
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0If \( 0 \leq x \leq \pi \) and \( 81^{\sin ^{2} x}+81^{\cos ^{2} x}=30 \), then \( x \) is equal to
(A) \( \frac{\pi}{6}, \frac{\pi}{3} \)
(B) \( \frac{\pi}{3}, \frac{\pi}{2} \)
(C) \( \frac{5 \pi}{6}, \frac{\pi}{3} \)
(D) \( \frac{2 \pi}{3}, \frac{\pi}{3} \)
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