We can do this by combining the two fractions into one. This is done by finding a common denominator, which in this case is $x^{4}-16$. The numerator then becomes $x(x^{2}+4)-(x-1)(x^{2}-4)$.
So, $f(x)=\frac{x(x^{2}+4)-(x-1)(x^{2}-4)}{x^{4}-16}$.
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