$\int_{2 - \log 3}^{3 + \log 3} \frac{\log (4 + x)}{\log (4 + x) + \log (9 - x)} \, dx = $

  • A
    $\frac{1}{2} + \log 3$
  • B
    $\frac{5}{2}$
  • C
    $\frac{1}{2} + \log 3$
  • D
    इनमें से कोई नहीं

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मान लीजिए $f(x) = 7 \tan^8 x + 7 \tan^6 x - 3 \tan^4 x - 3 \tan^2 x$ सभी $x \in \left(-\frac{\pi}{2}, \frac{\pi}{2}\right)$ के लिए है। तो सही व्यंजक है/हैं:
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$(B) \int_0^{\pi/4} f(x) dx = 0$
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$(D) \int_0^{\pi/4} f(x) dx = 1$

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