\( \int \frac{x^{3} d x}{\sqrt{1+x^{2}}} \) is equal to (A) \( \frac{1}{3} \sqrt{1+x^{2}}\left(2...
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0\( \int \frac{x^{3} d x}{\sqrt{1+x^{2}}} \) is equal to
(A) \( \frac{1}{3} \sqrt{1+x^{2}}\left(2+x^{2}\right)+C \)
(B) \( \frac{1}{3} \sqrt{1+x^{2}}\left(x^{2}-1\right)+C \)
(C) \( \frac{1}{3}\left(1+x^{2}\right)^{3 / 2}+C \)
(D) \( \frac{1}{3} \sqrt{1+x^{2}}\left(x^{2}-2\right)+C \)
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