यदि $\cos \left(\frac{\pi}{4}-x\right) \cos 2 x+\sin x \sin 2 x \sec x = \cos x \sin 2 x \sec x+\cos \left(\frac{\pi}{4}+x\right) \cos 2 x$ है,तो $\sec x$ का एक संभावित मान है

  • A
    $\frac{1}{2 \sqrt{2}}$
  • B
    $3 \sqrt{2}$
  • C
    $\frac{1}{\sqrt{2}}$
  • D
    $\sqrt{2}$

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