$\int \frac{\cos 2x - 1}{\cos 2x + 1} dx = $

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

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यदि $f\left(\frac{t+1}{2 t+1}\right)=t+1$ है, तो $\int f(x) d x=$

फलन का समाकलन कीजिए: $\frac{1}{\sqrt{7-6x-x^{2}}}$

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