$2\sec x-\csc x$
$\frac{x}{2}-1\le x$
$\frac{1+cos\left(x\right)}{1-cos\left(x\right)}$
$\frac{1-x}{-2\:}<2x$
$\left(x+3\right)\cdot\left(x^3\:-\:3\cdot x^2\:-\:6\cdot x\:+\:8\right)$
$\frac{dy}{dx}+25y=0$
$\frac{dy}{dx}=\left(\frac{x}{1+x}\right)^5$
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