$\left(m-2\right)\left(m-4\right)$
$\left(2x-3y^2\right)\left(x+y\right)$
$\left(5x+9y\right)\left(5x-9y\right)+81y^2$
$2.75\cdot\left(4.605-3.5\right)+1.37$
$7\cdot\left(-10\right)\cdot\left(-5\right)$
$cos2x=\frac{1-tan^2x}{sec^2x}$
$4\frac{3}{4}$
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