$\left(m-2n\right)^4$
$\frac{x^3\:+\:5x^2\:-\:5x\:-\:21\:}{x\:+\:2}$
$\int-x^2\:dx$
$3x+9=7x+1$
$100m^2n^2-169y^6$
$\ln\frac{x}{8}$
$\frac{\csc x+1}{\csc x-1}$
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