$f^2+7f-450$
$\ln\left(x\right)\left(x-1\right)^2$
$\frac{2^2-6a+4}{2a}$
$3=x\cdot\left(\cos\left(30\right)\right)$
$\left(x+2\right)\left(x+3\right)+3\left(x+2\right)\le0$
$4\frac{x^3-3x^2+2x+4}{x-7}$
$5\sqrt{-x^8}\:-2\sqrt{-x^{10}}\:+3\:\sqrt{x^{12}}$
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