$\int \frac{dx}{(2\sin x + \cos x)^2} = $

  • A
    $-\frac{1}{2} \left( \frac{1}{2\tan x + 1} \right) + c$
  • B
    $\frac{1}{2} \log |2\tan x + 1| + c$
  • C
    $\frac{1}{2 + \cot x} + c$
  • D
    $-\frac{1}{2} \left( \frac{1}{2\tan x - 1} \right) + c$

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