यदि $5 \sinh x - \cosh x = 5$ है,तो $\tanh x$ का एक मान है

  • A
    $\frac{2}{5}$
  • B
    $\frac{3}{5}$
  • C
    $\frac{-3}{5}$
  • D
    $\frac{-1}{5}$

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