मान लीजिए $I = \int_{0}^{1} \frac{x^{3} \cos 3x}{2+x^{2}} dx$. तो

  • A
    $-\frac{1}{2} < I < \frac{1}{2}$
  • B
    $-\frac{1}{3} < I < \frac{1}{3}$
  • C
    $-1 < I < 1$
  • D
    $-\frac{3}{2} < I < \frac{3}{2}$

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मान लीजिए $f(x)$,$(a, b)$ पर समाकलनीय है,जहाँ $b > a > 0$ है। यदि $I_1 = \int_{\frac{\pi}{6}}^{\frac{\pi}{3}} f(\tan \theta + \cot \theta) \sec^2 \theta \, d\theta$ और $I_2 = \int_{\frac{\pi}{6}}^{\frac{\pi}{3}} f(\tan \theta + \cot \theta) \csc^2 \theta \, d\theta$ है,तो अनुपात $\frac{I_1}{I_2}$ है:

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