જો $\sec \theta \cosh y = \operatorname{cosec} x$ અને $\operatorname{cosec} \theta \sinh y = \sec x$ હોય,તો $\sinh ^2 y =$

  • A
    $\cos ^2 x$
  • B
    $\cos x$
  • C
    $\sin ^2 x$
  • D
    $\sin x$

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