यदि $\sin x \cosh y = \cos \theta$ और $\cos x \sinh y = \sin \theta$ है,तो $\sinh^2 y =$

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

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