$a^2+4a+2$
$4-x<10$
$\frac{1}{11}\left(\ln\left(x\right)-\ln\left(y\right)\right)$
$200x^3-40x^2-2x$
$\frac{1}{2}x^2+\frac{1}{3}xy-\frac{1}{2}xy+\frac{1}{4}x^2$
$4\le2x^2+2$
$\frac{dy}{dx}\left(5x^2-2xy+7x^2=0\right)$
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