निम्नलिखित में से कौन सा गलत है?

  • A
    $\frac{d}{dx}[\sec^{-1}(\cosh x)] = \text{sech } x$
  • B
    $\frac{d}{dx}[\cos^{-1}(\text{sech } x)] = \text{sech } x$
  • C
    $\frac{d}{dx}[\tan^{-1}(\sinh x)] = \text{sech } x$
  • D
    $\frac{d}{dx}[\tan^{-1}(\tan \frac{x}{2})] = \frac{1}{2}$

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