यदि $\int_0^{2 \pi} |x \sin x| \, dx = k \pi$ है,तो $k =$

  • A
    $1$
  • B
    $2$
  • C
    $3$
  • D
    $4$

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$\int_{-\pi / 2}^{\pi / 2}(2 \sin |x|+\cos |x|) d x=$

माना $I_{n} = \int_{1}^{e} x^{19}(\log |x|)^{n} dx$,जहाँ $n \in N$ है। यदि $(20) I_{10} = \alpha I_{9} + \beta I_{8}$,प्राकृत संख्याओं $\alpha$ और $\beta$ के लिए है,तो $\alpha - \beta$ का मान ..... है।

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