જો $\int \frac{(x-1) dx}{(x+1) \sqrt{x^3+x^2+x}} = A \cdot \tan^{-1} \sqrt{f(x)} + \text{અચળ}$,તો ક્રમયુક્ત જોડ $(A, f(-1)) =$

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

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$\text{જો } \int \frac{1}{\operatorname{cosec} x+\cos x} d x = \frac{1}{2 \sqrt{3}} \log |f(x)| - \int \frac{\cos x-\sin x}{2+\sin 2 x} d x + c, \text{ હોય તો } x = \frac{\pi}{3} \text{ પર } |f(x)| = $

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