$2x^2-3x-5\:\:para\:x=3$
$\lim_{z\to a}\left(\frac{z^3+2az^2-z}{z^2+2az-1}\right)$
$\frac{dy}{dx}=-5\cdot x-3\cdot x\cdot y$
$20y^2-7y-6$
$\frac{16w^{2}-1}{4w+1}$
$\int\frac{\sqrt{25-16x^2}}{x^2}dx$
$\int_0^1\left(e^{-cx}\right)dx$
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