$\frac{x^n}{6^nx^3}$
$\left(3ab+4x\right)\left(3ab-4x\right)$
$\lim_{h\to\:0}\left(\frac{4h+h^2}{h}\right)$
$w^2+13w+9w$
$\int\:\frac{4x^6+3x^5-6x+1}{x^2}dx$
$2\cos^2x+5\cos x-3=0$
$\lim_{x\to+\infty}\left(x^2-x^3+6x^5-x^7\right)$
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