यदि $\int \frac{(x-1) dx}{(x+1) \sqrt{x^3+x^2+x}} = A \cdot \tan^{-1} \sqrt{f(x)} + \text{अचर}$, तो क्रमित युग्म $(A, f(-1)) =$

  • A
    $(2, 1)$
  • B
    $(2, -1)$
  • C
    $(1, 2)$
  • D
    $(-2, 2)$

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