$4p^2-4p-3$
$\lim_{x\to\infty}\frac{e^x}{x^k}$
$\lim_{x\to1}\left(x^{\frac{1}{x^2-1}}\right)$
$\left(xy-3\right)\left(xy+9\right)$
$x^4-5x^3+3x^2+2x+8+x-2$
$e^xdy+e^ydx=0$
$x^2-2x-39$
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