$5x^2-10x-40$
$53^2$
$\frac{\left(-1\right)^nx^n}{9^n}$
$1821\:-4000$
$\frac{dy}{dx}=\frac{-\sqrt{y^2+1}}{3x^2\cdot y}$
$\frac{5x^2y^{-3}}{15x^5}$
$\lim_{x\to4}\frac{7x+28}{x^2+x-12}$
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