$\frac{sex\left(x\right)}{1-sec\left(x\right)}-\frac{sec\left(x\right)}{1+sec\left(x\right)}$
$-\left|-21\right|$
$7-x\ge5$
$2m^4n^2.2mn^4$
$\lim_{x\to7}\:\left(2x+3\right)$
$\frac{dy}{y}=1$
$\frac{2x^3-5x^2+x-2}{x-1}$
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