$m^2-6m+8$
$\left(2t^2+4\right)\left(2t^2-8\right)$
$\left(7u\right)^2$
$2x^3+5x^2-3x+3x^3+2x^2-5x$
$\cot x=\cos x\csc x$
$\left(1.7\cdot10^{-2}\right)^2$
$4x^4-9y^2z^2$
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