$\operatorname{coth}^2 x - \tanh^2 x =$

  • A
    $4 \operatorname{cosech} 2x \tanh 2x$
  • B
    $4 \operatorname{sech} 2x \operatorname{coth} 2x$
  • C
    $4 \operatorname{sech} 2x \tanh 2x$
  • D
    $4 \cosh 2x (\operatorname{cosech} 2x)^2$

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