$\int \frac{\sec^2 x}{(\sec x + \tan x)^{5/2}} dx =$

  • A
    $ -(\sec x + \tan x)^{-1/2} - \frac{1}{5}(\sec x + \tan x)^{-5/2} + c$
  • B
    $-\frac{2}{5}(\sec x - \tan x)^{-5/2} - \frac{2}{7}(\sec x - \tan x)^{-7/2} + c$
  • C
    $-\frac{2}{3}(\sec x + \tan x)^{-3/2} - \frac{2}{7}(\sec x + \tan x)^{-7/2} + c$
  • D
    $-\frac{2}{5}(\sec x + \tan x)^{-5/2} + \frac{2}{7}(\sec x + \tan x)^{-7/2} + c$

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