$\frac{\sec x+1}{\tan x}$
$y^2-6y+16$
$15c^2d^2\:+\:60c^2d$
$-\frac{x-2}{x+8}$
$3y^2\left(y-9\right)-5\left(y-9\right)$
$\frac{dy}{dx}+0.03y=0.75$
$\left(3a-4\right)\left(4a-2\right)$
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