यदि $I = \int\limits_0^{\frac{\pi}{2}} \ln(\sin x) dx$ है,तो $\int\limits_{-\frac{\pi}{4}}^{\frac{\pi}{4}} \ln(\sin x + \cos x) dx =$

  • A
    $\frac{I}{2}$
  • B
    $\frac{I}{4}$
  • C
    $\frac{I}{\sqrt{2}}$
  • D
    $I$

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$a$ के उन मानों का समुच्चय ज्ञात कीजिए जिनके लिए असमिका $\int_{a}^{0} (3^{-2x} - 2 \cdot 3^{-x}) \, dx \geq 0$ सत्य है:

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