$\frac{4x^2-9y^2}{2x-3y}$
$\left(2x-2y-2z\right)\left(2x+y+z\right)$
$\tan\left(c\right)\sin\left(c\right)+\cos\left(c\right)$
$4<1+\frac{n}{7}$
$x^{2}+8<2x$
$-1+2-\left(-2+-1\right)$
$3s+4n+6n$
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