નીચેનામાંથી કયું પદ હંમેશા સાચું છે?

  • A
    $\cosh \frac{x}{2}=\sqrt{\frac{\cosh x-1}{2}}$
  • B
    $\tanh \left(\frac{x}{2}\right)=\frac{2 \sinh x}{\cosh x+1}$
  • C
    $\sinh \left(\frac{x}{2}\right)=\frac{\sinh x}{\sqrt{2(\cosh x+1)}}$
  • D
    $\sinh \left(\frac{x}{2}\right)=\frac{\sinh x}{\sqrt{2(\cosh x-1)}}$

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