यदि $\cosh \alpha + \sinh \alpha = e^3$ और $\sinh x = \frac{\alpha}{\alpha+1}$ है,तो $\tanh x =$

  • A
    $\frac{\alpha}{\alpha+2}$
  • B
    $\frac{\alpha}{\alpha-3}$
  • C
    $\frac{\alpha}{\alpha+4}$
  • D
    $\frac{2 \alpha}{\alpha-1}$

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