$\frac{a}{c}-\frac{b}{d}$
$y\:+5y'+10y=510e^2tcos6t$
$\frac{10}{10^2}^8$
$13a^2+7a-6$
$\left(a\:x\:+\:x\:y\right)\left(a\:x\:-\:x\:y\right)$
$\int t\cdot\left(1+2t\right)^2dt$
$\lim_{x\to0}\left(\frac{4xcos2x-sen2x}{4x^3}\right)$
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