$2m\left(2m-4n\right)-2\left(2m-4n\right)$
$cos\:xcot\:x$
$\left(6-x\right)\left(x+4\right)$
$51=3k$
$\frac{x^{-2}}{y^{-2}}$
$\frac{\left(4a+b\right)^2-\left(4a-b\right)^2}{8ab}$
$4r^2-25$
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