$\int \frac{\tan x}{\sec x + \tan x} \, dx = $

  • A
    $\sec x + \tan x - x + c$
  • B
    $\sec x - \tan x + x + c$
  • C
    $\sec x + \tan x + x + c$
  • D
    $-\sec x - \tan x + x + c$

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मान लीजिए $f(x) = \frac{1}{x} \ln \left( \frac{x}{e^x} \right)$,तो $x$ के सापेक्ष इसका आदिम (primitive) क्या होगा?

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