$n^2-7n+12$
$cos\left(t\right)=\frac{x}{2}$
$\left(\sin\left(x\right)+1\right)^2+\cos^2\left(x\right)=2$
$\frac{6x^5y^2}{8xy^4}$
$-10x^2-40x+30$
$x^2-\left(a+b\right)^2$
$4x\:-\:7\:=\:9$
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