$\int \frac{dx}{\tan x + \cot x} = $

  • A
    $\frac{\cos 2x}{4} + c$
  • B
    $\frac{\sin 2x}{4} + c$
  • C
    $-\frac{\sin 2x}{4} + c$
  • D
    $-\frac{\cos 2x}{4} + c$

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