$\left(4x^2-3x-1\right)\left(2x-5\right)$
$x+y-x-y$
$x^2\left(4y-1\right)$
$\lim_{x\to\infty}\left(\frac{e^{3x}}{x^3+5x^2+2x+1}\right)$
$a^2x+b^2x$
$2k\:+\:7k\:=\:9$
$\frac{dy}{dx}\left(y^3=xy^2+x^4\right)$
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