$x>0$ के लिए $\int \frac{x^{2}-1}{x^{4}+3 x^{2}+1} d x$ का मान ज्ञात कीजिए।

  • A
    $\tan ^{-1}\left(x+\frac{1}{x}\right)+C$
  • B
    $\tan ^{-1}\left(x-\frac{1}{x}\right)+C$
  • C
    $\log _{e}\left|\frac{x+\frac{1}{x}-1}{x+\frac{1}{x}+1}\right|+C$
  • D
    $\log _{e}\left|\frac{x-\frac{1}{x}-1}{x-\frac{1}{x}+1}\right|+C$

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फलन $\frac{x^{3} \sin \left(\tan ^{-1} x^{4}\right)}{1+x^{8}}$ का समाकलन कीजिए।

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$\int \frac{x^3}{\sqrt{1 - x^8}} \, dx = $

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