$\frac{4x}{x^4+2x^2+1}$
$\left(a^3+12\right)\left(a^3+15\right)$
$\frac{27y^6+1}{3y^2+1}$
$\int\frac{54}{x^4+2x^3-3x^2-4x+4}dx$
$-10.675\:-\left(-3.21\right)$
$n-2+3+8n$
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