$\lim_{x\to0}\frac{\sqrt{x}}{x+1}$
$\left(4a^2b\:-\:3a\right)\left(4a^2b\:+\:9a\right)$
$49m^6-70am^3n+25a^2n^4$
$\int\frac{s^2-2}{s^4-1}ds$
$\int\frac{x^4+81}{x\left(x^2+9\right)^2}dx$
$9x^3+36x^2+54x+27$
$\left(x+8\right)\left(x-25\right)$
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