$f\left(a\right)=\frac{3}{a\left(a^2+4\right)}$
$100-45x^2+x^4$
$\left[\frac{5}{1}\right]$
$\sqrt{\sqrt[3]{a^2}-\sqrt[3]{x^2}}$
$\ln\left(e^n\right)$
$\frac{2x^2+14x+24}{2x+4}$
$\lim_{x\to0}\left(\frac{3x^2-5}{2x^2+1}\right)$
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