यदि $f(x) = \int_0^x {t\sin t\,dt} $ है,तो $f'(x) = $

  • A
    $x\cos x + \sin x$
  • B
    $x\sin x$
  • C
    $x\cos x$
  • D
    इनमें से कोई नहीं

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यदि $I=\int_{-a}^a(x^4-2x^2)dx$ है,तो $I$ का मान $a=$ पर न्यूनतम है।

$\lim _{n \rightarrow \infty} \frac{1}{n}\left\{\sin ^5\left(\frac{\pi}{6 n}\right)+\sin ^5\left(\frac{2 \pi}{6 n}\right)+\sin ^5\left(\frac{3 \pi}{6 n}\right)+\ldots+\sin ^5\left(\frac{\pi}{2}\right)\right\} = $

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