यदि $y=\sqrt{2 x+\cos ^2\left(2 x+\frac{\pi}{4}\right)}$ है,तो $x=\frac{\pi}{4}$ पर $\frac{d y}{d x}$ ज्ञात कीजिए।

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

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