$\lim_{z\to\frac{2}{3}}\left(\frac{\left|-3z+2\right|}{18z^2-8}\right)\:$
$\left(x+y\right)\left(x-10y\right)$
$\sin\left(x\right)+4\cos\left(5y\right)=4$
$\left(2m-5n\right)\left(2m+3n\right)$
$\lim_{y\to7}\left(\frac{\frac{1}{y+9}-\frac{1}{16}}{y-7}\right)$
$\frac{1+csc\theta\:}{cot\:\theta\:\:+cos\:\theta\:}=sec\theta\:$
$pxp-qxq$
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