$\frac{dy}{dx}=\frac{y-4x}{x-y}$
$\int\frac{u}{\left(u^2-u-2\right)}dx$
$\lim_{x\to2}\left(x^2-4\cdot x+1\right)$
$\frac{dy}{dx}2x+y=3x^2$
$-4x^2+5x-6$
$40+\:\left(-28\right)-\left(-42\right)$
$\int\:\left(\frac{x^3+x^2-3x}{x^2+1}\right)dx$
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