यदि $\tanh x = \frac{1}{2}$ है,तो $\sinh 2x - \text{sech } 2x = $

  • A
    $\frac{29}{15}$
  • B
    $\frac{11}{15}$
  • C
    $3$
  • D
    $\frac{-13}{15}$

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