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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$I \subset R-\{-1,1\}$ पर, $\int \tan ^{-1}\left(\frac{2 x}{1-x^2}\right) d x=$

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