$xy'-xy=4y$
$\left(x^2+19\right)\left(x-3\right)$
$\frac{cos\left(t\right)}{tan\left(t\right)}$
$a^2x^2-b^4y^4$
$\frac{5}{\:6}x^2-\frac{1}{6}x^2-\frac{1}{3}x^2$
$\ln x=42$
$\lim_{x\to1}\left(\left(x-1\right)\cdot\frac{cos\left(x\right)}{x^3-17x^2+80x-64}\right)$
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