$at+bt$
$\left(3x^3-2y^2\right)^3$
$\left(\frac{z}{3}-2\right)^3$
$\frac{d^2}{dx^2}\left(\frac{xy}{x+y+z}\right)$
$\lim_{x\to-2}\left(\frac{2y^2-8y+8}{y^3+4y^2+4y}\right)$
$\frac{3}{4}+\frac{1}{4}+1$
$\int\frac{9x-2x^2+4}{\left(x-3\right)\left(x^2+4\right)}dx$
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