यदि $\int x^3 \sin 3x \, dx = \frac{1}{27}[f(x) \cos 3x + g(x) \sin 3x] + c$ है, तो $f(1) + g(1) =$

  • A
    $14$
  • B
    $6$
  • C
    $4$
  • D
    $12$

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मान ज्ञात कीजिए: $\int u \frac{d^2v}{dx^2} dx - \int v \frac{d^2u}{dx^2} dx$

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