$\frac{dy}{dx}=sen\:\left(x-y\right)$
$-23\cdot93$
$4x+10<-2x-8$
$r+5+3r^2+6r$
$\frac{x+y}{2}-\frac{x-y}{2}$
$-x^2+6x-4+x^3-3x^2+6x-4$
$\lim_{x\to1}\frac{2x}{x^2-7x+6}$
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