$-x^2+2x+1$
$y^2+7y-44$
$\int\left(e^{jt}\right)dt$
$x\left(1+xy^2\right)$
$\left(\sqrt{\:2}-\frac{x}{3}\right)^2$
$\lim_{x\to a}\left(\frac{x^4-1}{x^3-1}\right)$
$\lim_{x\to\infty}\left(\frac{40x^5+15x^2}{9x^4+36x^3-x-4}\right)$
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