$i ( 2 + i )$
$125n^2+200n+80$
$\sqrt[3]{16x^{15}y^{17}}$
$\frac{x^4-9}{x^2-3}$
$2x^2-12x-10$
$\frac{x^5+2x^3-3}{x-1}$
$2cos^2x+4=5-cosx$
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