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

  • A
    $\log \left|\cos ^2 x+\sin ^2 x\right|+c$
  • B
    $\log \left|\frac{\cos ^2 x}{2}+\sin ^2 x\right|+c$
  • C
    $\log \left|\cos ^2 x+\frac{\sin ^2 x}{2}\right|+c$
  • D
    $\log \left|\frac{\cos ^2 x}{2}+\frac{\sin ^2 x}{2}\right|+c$

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