$81a^2-9b^{12}$
$\frac{36}{3^2}$
$\left(5a-b^2\right)\left(5a+b^2\right)$
$y'\:-\:y\:=\:\sin\left(t\right)\:\:$
$\frac{x^2y^3}{xy^2}$
$\left(x^n+a\right)^2$
$\lim_{x\to4}3x^4+6$
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