\( \int \frac{x^{3}-1}{x^{3}+x} d x \) is equal to
(A) \( x-\log x+\log \left(x^{2}+1\right)-\ta...
\( \int \frac{x^{3}-1}{x^{3}+x} d x \) is equal to
(A) \( x-\log x+\log \left(x^{2}+1\right)-\tan ^{-1} x+C \)
(B) \( x-\log x+\frac{1}{2} \log \left(x^{2}+1\right)-\tan ^{-1} x+C \)
(C) \( x+\log x+\frac{1}{2} \log \left(x^{2}+1\right)+\tan ^{-1} x+C \)
(D) none of these
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