$\frac{8}{x^{2-2x-15}}$
$50>6x+20$
$\lim_{x\to0}\left(x^3-7x+-3\right)$
$\lim_{x\to3}\left(3-x\right)\left(9+3x\right)$
$\frac{dy}{dx}=-\frac{4x^3+2y+ycosx}{2x+senx+2y}$
$5x-2y=1$
$\frac{dy}{dx}=-\frac{y}{7x}$
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