$\lim_{x\to5}\left(x+2\right)$
$\lim_{x\to2}\frac{x^2-8x+12}{x-2}$
$\frac{d}{dx}y=x^2+\frac{3}{x^2}$
$\:\left(3xy-5\right)\left(4xy-2\right)$
$4^2+4^4$
$\left(m+7\right)\left(m+9\right)$
$\log_{10}\left(x+1\right)+\log_{10}\left(x-1\right)=1$
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