$\lim_{x\to0}\left(\frac{1+\cos\left(x\right)}{x^2}\right)$
$4x^2-28x+1$
$\int\frac{-14}{\left(2x+3\right)\left(x-2\right)}dx$
$\frac{d}{dx}-3sin^3x$
$x^2+4x+4=9$
$x+3yz+y+3xz$
$\left(2a+b\right)\left(2b+a\right)$
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