$m, n \in \mathbb{Z}$ के लिए $\int_0^{2 \pi} \cos m x \cos n x \, dx + \int_{-\pi}^\pi \sin m x \cos n x \, dx$ का मान ज्ञात कीजिए।

  • A
    $0$,यदि $m \neq n$
  • B
    $\pi$,यदि $m = n \neq 0$
  • C
    $2\pi$,यदि $m = n$
  • D
    $\pi/2$,यदि $m = n$

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$\int_0^1 \frac{\log _e(1+x)}{1+x^2} d x=$

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