If $\cos \theta+\sin \theta=\sqrt{2} \cos \theta$ and $0 < \theta < \frac{\pi}{2}$ then $\sec 2 \theta+\tan 2 \theta=$

• Correct answer
  A

  $\cot \theta$
• B

  $\tan \theta$
• C

  $\cos \theta$
• D

  $\sin \theta$

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