$\frac{4x^4+8x^3+10x^2}{2x}$
$\int\frac{1}{\left(n-n^2\right)}dn$
$18x^2-45x+27$
$\frac{d}{dx}\sin\left(\arccos\left(4x\right)\right)$
$f\left(x\right)=\sqrt{6x^8-x^5}$
$un=\left\{\left(-2\right)^n\right\}n^30$
$\log x-\log5=2$
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