Evaluate the indefinite integral.
∫
3
x
+
1
x
2
+
1
d
x
\displaystyle \int\frac{{{3}{x}+{1}}}{{{x}^{{2}}+{1}}}{\left.{d}{x}\right.}
∫
x
2
+
1
3
x
+
1
d
x
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