$\int_3^{\infty}\left(\frac{1}{cos^2\left(x\right)}\right)dx$
$\frac{dx}{dy}=\frac{x-2}{y}$
$5\left(a+b\right)-y+12$
$\frac{3m^{-3}n^2}{2m^{-4}n^2}$
$\:21\:+\:1-2$
$x+4\ge-1$
$\frac{-2x+-2}{-1x+-4}$
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