$\int \frac{\sec^2 x}{(\sec x + \tan x)^2} dx =$

  • A
    $\frac{3+(\sec x+\tan x)^2}{2(\sec x+\tan x)^3}+c$
  • B
    $-\frac{1+3(\sec x+\tan x)^2}{6(\sec x+\tan x)^3}+c$
  • C
    $-\frac{3+(\sec x+\tan x)^2}{2(\sec x+\tan x)^3}+c$
  • D
    $-\frac{1+(\sec x+\tan x)}{3(\sec x+\tan x)^2}+c$

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

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