यदि $\int x \sin x \, dx = -x \cos x + A$ है,तो $A = $

  • A
    $\sin x + \text{अचर}$
  • B
    $\cos x + \text{अचर}$
  • C
    $\text{अचर}$
  • D
    $\text{इनमें से कोई नहीं}$

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$\text{यदि } \int x^4(\log x)^3 dx = x^5[A(\log x)^3 + B(\log x)^2 + C \log x + D] + k, \text{ तो } A + B + C + 5D = $

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