$1-x^2+2x+1$
$\lim_{x\to0}\left(\frac{\left(4e^{\left(6-2x\right)}-x^2\right)}{\left(x+1\right)}\right)$
$c^2+15c-100$
$w^3+27n^3$
$16x^8-46x^5y+64m^2n$
$x\frac{dy}{dx}=4y$
$\left(x^2+\frac{1}{x}^2\right)\left(x^3+\frac{1}{x}^3\right)$
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