$\int \frac{x^4+1}{x^6+1} \, dx =$

  • A
    $\tan^{-1} x - \tan^{-1} x^3 + c$
  • B
    $\tan^{-1} x - \frac{1}{3} \tan^{-1} x^3 + c$
  • C
    $\tan^{-1} x + \tan^{-1} x^3 + c$
  • D
    $\tan^{-1} x + \frac{1}{3} \tan^{-1} x^3 + c$

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

निम्नलिखित कथनों का अवलोकन करें:
$A: \int \left(\frac{x^2-1}{x^2}\right) e^{\frac{x^2+1}{x}} d x = e^{\frac{x^2+1}{x}} + c$
$R: \int f^{\prime}(x) e^{f(x)} d x = f(x) + c$
तो निम्नलिखित में से कौन सा सत्य है?

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