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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यदि $f(x) = \int \left[ \tan^2 x + \cot^2 x + \frac{4(\sin^3 x + \cos^3 x)}{\sin^2 2x} \right] dx$ और $f\left(\frac{\pi}{4}\right) = 0$ है, तो $3 \left[ f\left(\frac{\pi}{6}\right) + 2 \right] = $

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