If $f(x) = \frac{\sin^2 x}{1+\cot x} + \frac{\cos^2 x}{1+\tan x}$,then the value of $f^{\prime}\left(\frac{\pi}{6}\right)$ is equal to

  • A
    $0$
  • B
    $\frac{1}{2}$
  • C
    $-\frac{1}{2}$
  • D
    $\frac{\sqrt{3}}{2}$

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