$\int \frac{f(x) \varphi^{\prime}(x)+\varphi(x) f^{\prime}(x)}{(f(x) \varphi(x)+1) \sqrt{f(x) \varphi(x)-1}} dx=$

  • A
    $\sin ^{-1} \sqrt{\frac{f(x)}{\varphi(x)}}+c$
  • B
    $\cos ^{-1} \sqrt{(f(x))^{2}-(\varphi(x))^{2}}+c$
  • C
    $\sqrt{2} \tan ^{-1} \sqrt{\frac{f(x) \varphi(x)-1}{2}}+c$
  • D
    $\sqrt{2} \tan ^{-1} \sqrt{\frac{f(x) \varphi(x)+1}{2}}+c$

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