$\frac{x^2+11+28}{x+4}$
$\left(30+12\right)\left(30^2-12^2\right)$
$\frac{5^4}{5^{-4}}$
$2\tan^2-3\tan+1=0$
$3x+7y+4a+6y-2x+5$
$\left(-2\right)^3\cdot\left(-2\right)^4$
$x^2+2\sqrt{4}+4$
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