यदि $\int x^3 \sin 3x \, dx = f(x) \cos 3x + g(x) \sin 3x + c$ है, तो $27(f(x) + x g(x)) =$

  • A
    $18x^3 + 4x$
  • B
    $8x$
  • C
    $4x$
  • D
    $18x^3 + 8x$

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