Suppose $f(x) = \frac{(2^x + 2^{-x}) \tan x \sqrt{\tan^{-1}(x^2 - x + 1)}}{(7x^2 + 3x + 1)^3}$. Then the value of $f'(0)$ is equal to

  • A
    $\pi$
  • B
    $0$
  • C
    $\sqrt{\frac{\pi}{4}}$
  • D
    $\frac{\pi}{2}$

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