જો $\int [ \cos(x) \cdot \frac{d}{dx}(\csc(x)) ] dx = f(x) + g(x) + c$ હોય,તો $f(x) \cdot g(x) =$

  • A
    $x \cot(x)$
  • B
    $x \tan(x)$
  • C
    $x \cos(x)$
  • D
    $1$

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