यदि $\int {{e^{\sec x}}\left( {\sec x + \tan x f(x) + (\sec x \tan x + \sec^2 x)} \right)dx = {e^{\sec x}}f(x) + C}$ है,तो $f(x)$ का एक संभावित विकल्प क्या है?

  • A
    $\sec x - \tan x - \frac{1}{2}$
  • B
    $x \sec x + \tan x + \frac{1}{2}$
  • C
    $\sec x + x \tan x - \frac{1}{2}$
  • D
    $\sec x + \tan x + \frac{1}{2}$

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$\int e^{x}\left(\frac{1-x}{1+x^{2}}\right)^{2} \,d x=$

$\int {{e^x} \left[ \frac{1 + x \log x}{x} \right] \, dx} = $

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