$\left(m^3+n^4\right)^2$
$2\left(x+1\right)<x+6$
$3abc^2\sqrt{abc}$
$\frac{1}{4}b-\frac{2}{5}b+\frac{1}{5}b$
$\sqrt{4.2}$
$3\cos\left(4x-4\pi\right)$
$4u^2+8u-5$
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