$4i^2-5i-2$
$x^2-9<0$
$\frac{2x^2-3}{x^3+3x^2+3x+1}$
$8a^2b-ab$
$49a^4b^4-16c^4-16c^4$
$3b+6$
$\int\frac{\left(x^2\right)}{\left(x-4\right)\left(x+5\right)}dx$
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