यदि $[x]$ महत्तम पूर्णांक $\leq x$ है,तो $\pi^{2} \int_{0}^{2}\left(\sin \frac{\pi x}{2}\right)(x-[x])^{[x]} d x$ का मान ज्ञात कीजिए :

  • A
    $2(\pi-1)$
  • B
    $4(\pi-1)$
  • C
    $4(\pi+1)$
  • D
    $2(\pi+1)$

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$\int_0^\pi x \sin^3 x \cos^2 x \, dx =$

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