यदि $f(x) = \frac{\sin^{2} x}{1+\cot x} + \frac{\cos^{2} x}{1+\tan x}$ है,तो $f^{\prime}\left(\frac{\pi}{4}\right)$ है

  • A
    $\sqrt{3}$
  • B
    $\frac{1}{\sqrt{3}}$
  • C
    $0$
  • D
    $-\sqrt{3}$

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