$n \geq 2$ के लिए,यदि $I_n = \int \sec^n x \, dx$ है,तो $I_4 - \frac{2}{3} I_2 =$

  • A
    $\sec^2 x \tan x + c$
  • B
    $\frac{1}{3} \sec^2 x \tan x + c$
  • C
    $\frac{2}{3} \sec^2 x \tan x + c$
  • D
    $\frac{1}{2} \log |\sec x + \tan x| + c$

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