$\int_0^{\pi /4} \frac{\sec^2 x}{(1 + \tan x)(2 + \tan x)} \,dx = $

  • A
    $\log_e \left( \frac{2}{3} \right)$
  • B
    $\log_e 3$
  • C
    $\frac{1}{2} \log_e \left( \frac{4}{3} \right)$
  • D
    $\log_e \left( \frac{4}{3} \right)$

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