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

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

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$\int {\frac{{{x^2} - 1}}{{{x^4} + {x^2} + 1}}\,dx = }$

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$k \in N$ ની કઈ કિંમત માટે સંકલન $I_n = \int_0^1 (1 - x^k)^n dx, n \in N$,એ $147 I_{20} = 148 I_{21}$ નું સમાધાન કરે છે?

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