$\left(3u+4w\right)\left(3u-4w\right)$
$\left(7x\:-\:9x\right)+\left(4x\:+\:2x\right)$
$\left(3a+b^2\right)\left(9a^2-3ab^2+b^4\right)$
$y=xy'$
$x^2=4py\:$
$\lim_{x\to2}\left(\frac{x^2-4x+4}{x-2}\right)$
$\lim_{x\to\infty}\left(ln7x-ln\left(x+1\right)\right)$
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