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

  • A
    $\frac{1}{2} \cot^{-1}(x^2) + c$
  • B
    $\frac{1}{2} \tan^{-1}(x^2) + c$
  • C
    $\cot^{-1}(x^2) + c$
  • D
    $\tan^{-1}(x^2) + c$

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જો $\int \sqrt[3]{x}\left\{1+\sqrt[3]{x^4}\right\}^{1 / 7} d x=A\left(1+\sqrt[3]{x^4}\right)^B+c$ હોય,તો $A B$ ની કિંમત શોધો.

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જો $\int {\frac{{({x^2} - 1)\,dx}}{{({x^4} + 3{x^2} + 1)\,{{\tan }^{ - 1}}\left( {\frac{{{x^2} + 1}}{x}} \right)}}} = \ln | f(x) | + C$ હોય,તો $f(x)$ શું છે?

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