$0 \leq x \leq \pi$ के लिए,यदि $81^{\sin ^2 x}+81^{\cos ^2 x}=30$ है,तो $x=$

  • A
    $\frac{\pi}{6}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{\pi}{15}$
  • D
    $\frac{\pi}{8}$

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