$h^2+4h+4$
$\sqrt{21-7}$
$36-25u^2v^2$
$\frac{40}{\frac{\:1}{6}}$
$\frac{4x^2+17x-38}{x+6}$
$\left(34c+76\right)\left(34c-15a\right)$
$36-x^2y^4$
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