$\lim_{x\to0}\left(\frac{9}{x^2+4x+9}\right)$
$\frac{x^5}{x-2}$
$\int\frac{80x^3}{cos^2\left(5x^4+1\right)}dx$
$-100+56+79+\left(-50\right)+\left(-20\right)$
$\frac{dy}{dx}=\left(y-3\right)\left(y-5\right)$
$\frac{d}{dx}\sqrt{t+6}$
$0\left(-4\right)-4\left(-4\right)$
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