$\lim_{x\to\infty}\left(\frac{e^x-e^{-x}}{x}\right)$
$\frac{2x^3-5x^2-1}{x^2-4x+5}$
$\:\:\left(-2\right)\left(-3\right)\left(2\right)\left(-1\right)\left(1\right)\left(-2\right)$
$9-12t+4t^2$
$\left(-1+\frac{4x}{z}\right)^2$
$2x\frac{dy}{dx}=x+3y$
$4^2+2^3-2^2-3^3$
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