$x$ के सापेक्ष $\cos^{-1} \sqrt{\frac{1 + x^2}{2}}$ का अवकलज ज्ञात कीजिए।

  • A
    $-\frac{1}{2\sqrt{1 - x^4}}$
  • B
    $\frac{1}{2\sqrt{1 - x^4}}$
  • C
    $-\frac{x}{\sqrt{1 - x^4}}$
  • D
    $\frac{x}{\sqrt{1 - x^4}}$

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