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

  • A
    $-\frac{1}{\sqrt{2}} \operatorname{Sinh}^{-1} \left( \frac{x+6}{\sqrt{7}(x+2)} \right) + c$
  • B
    $-\frac{1}{\sqrt{2}} \operatorname{Sinh}^{-1} \left( \frac{x+6}{\sqrt{7}(x+2)} \right) + c$
  • C
    $\frac{1}{\sqrt{2}} \operatorname{Sinh}^{-1} \left( \frac{x+6}{\sqrt{7}(x+2)} \right) + c$
  • D
    $-\frac{1}{\sqrt{2}} \operatorname{Cosh}^{-1} \left( \frac{x+6}{\sqrt{7}(x+2)} \right) + c$

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જો $\int f(x) \cos x \, dx = \frac{1}{2} [f(x)]^2 + C$ અને $f(0) = 0$ હોય, તો $f'(0) = $

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