જો $f(x) = 4x^3 + 3x^2 + 3x + 4$,$x \neq 0$ હોય,તો $\frac{d}{dx}\left(x^3 \cdot f\left(\frac{1}{x}\right)\right) =$ . . . . . .

  • A
    $24x^5 + 15x^4 + 12x^3 + 12x^2$
  • B
    $\frac{x^2}{12} + \frac{x}{6} + \frac{1}{3}$
  • C
    $\frac{12}{x^2} + \frac{6}{x} + 3$
  • D
    $12x^2 + 6x + 3$

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