$\int \frac{dx}{(x+1) \sqrt{x^2+1}} = $

  • A
    $-\frac{1}{\sqrt{2}} \operatorname{Sinh}^{-1}\left(\frac{1-x}{\sqrt{2}(1+x)}\right) + c$
  • B
    $\frac{1}{\sqrt{2}} \operatorname{Sinh}^{-1}\left(\frac{1-x}{\sqrt{2}(1+x)}\right) + c$
  • C
    $-\frac{1}{\sqrt{2}} \operatorname{Sinh}^{-1}\left(\frac{1+x}{\sqrt{2}(1-x)}\right) + c$
  • D
    $\frac{1}{\sqrt{2}} \operatorname{Sinh}^{-1}\left(\frac{1+x}{\sqrt{2}(1-x)}\right) + c$

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$\int \frac{dx}{\tan x+\cot x+\sec x+\operatorname{cosec} x} = $

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