यदि $2 f(\sin x) + f(\cos x) = x$ है,तो $f^{\prime}(x) = $

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

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