यदि $\cot[f(x)] = \frac{3x - x^3}{1 - 3x^2}$ और $\sin[g(x)] = \frac{1 - x^2}{1 + x^2}$ है, तो $\lim_{x \to t} \frac{f(x) - f(t)}{g(x) - g(t)} = \dots$

  • A
    $\frac{3}{2(1+t^2)}$
  • B
    $\frac{3}{2}$
  • C
    $\frac{5}{2}$
  • D
    $-\frac{5}{2(1+t^2)}$

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