$\int \frac{1}{(2 \cos x+\sin x)^2} d x=$

  • A
    $\frac{1}{2+\tan x}+c$
  • B
    $-\frac{1}{2 \tan x+1}+c$
  • C
    $\frac{\cos x}{\cos x+2 \sin x}+c$
  • D
    $-\frac{\cos x}{2 \cos x+\sin x}+c$

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