$(1+\sec 2\theta)(1+\sec 4\theta) = $

  • A
    $\tan \theta \tan 4\theta$
  • B
    $\cot \theta \tan 4\theta$
  • C
    $4 \cot \theta \tan 4\theta$
  • D
    $4 \tan \theta \tan 4\theta$

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