$81n^2+90n+100$
$\int\frac{4x^3}{\left(4x^2+1\right)}dx$
$\left(3a+7b\right)^3$
$7+5-\left(-34\right)$
$5\left(3x-1\right)-20<2\left(3x+1\right)$
$\tan\left(\frac{5cm}{12cm}\right)$
$\frac{4r}{\sqrt{3}}$
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