Evaluate the integral:
∫
12
x
2
x
2
+
49
d
x
\displaystyle \int\frac{{12}}{{{x}^{{2}}\sqrt{{{x}^{{2}}+{49}}}}}{\left.{d}{x}\right.}
∫
x
2
x
2
+
49
12
d
x
+ C
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