\( \int \frac{x^{2}+1}{x^{4}-x^{2}+1} d x \) is equal to \( \mathrm...

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\( \int \frac{x^{2}+1}{x^{4}-x^{2}+1} d x \) is equal to
\( \mathrm{P}^{13} \)
W
(1) \( \tan ^{-1}\left(\frac{x^{2}-1}{x}\right)+c \)
(2) \( \tan ^{-1}\left(\frac{x^{2}+1}{2 x}\right)+c \)
(3) \( -\tan ^{-1}\left(\frac{x^{2}-1}{x}\right)+c \)
(4) \( \tan ^{-1}\left(\frac{x^{2}-1}{2 x}\right)+c \)
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