यदि $y=\cos ^{-1}\left(\frac{a^2}{\sqrt{x^4+a^4}}\right)$ है,तो $\frac{d y}{d x}$ क्या है?

  • A
    $\frac{2 a^2 x}{x^4+a^4}$
  • B
    $\frac{2 a^2 x^2}{\sqrt{x^4+a^4}}$
  • C
    $\frac{a^4 x^4}{x^4+a^4}$
  • D
    $\frac{a^4 x^2}{2 \sqrt{x^4+a^4}}$

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