જો $f(x) = \tan^{-1}\left(\frac{1}{\sin^2 x + \sin x + 1}\right) + \tan^{-1}\left(\frac{1}{\sin^2 x + 3\sin x + 3}\right) + \tan^{-1}\left(\frac{1}{\sin^2 x + 5\sin x + 7}\right) + \dots$ $10$ પદો સુધી હોય,તો $f'(0) = $

  • A
    $\frac{-1}{101}$
  • B
    $\frac{100}{101}$
  • C
    $\frac{-100}{101}$
  • D
    $0$

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$\frac{d}{dx}\left( \tan^{-1}\sqrt{\frac{1 + \cos(x/2)}{1 - \cos(x/2)}} \right)$ ની કિંમત શોધો.

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