Q65 / 160 · AP EAMCET 2017 (26 Apr Shift 2) · Mathematics

If $\tanh ^2 x=\tan ^2 \theta$ then $\cosh 2 x=$

  • A
    $\cos \theta$
  • B
    $\sin \theta$
  • C
    $\cos 2 \theta$
  • Correct answer
    D
    $\sec 2 \theta$

Hence, the correct answer is option: 'D'.

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