Answer
$\frac{f(f^{2}+1)}{2}$
Work Step by Step
Given : $\frac{5f^{2}}{\frac{10f}{f^{2}+1}}$
This becomes : $5f^{2} \times \frac{f^{2}+1}{10f}$
$= \frac{f(f^{2}+1)}{2}$
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