$2.1-1.4$
$\frac{1-2\cos^2\left(x\right)}{\cos^2\left(x\right)}$
$a^6-\left(a+3\right)^3$
$\left(2a-3b+a^2\right)^2$
$15x^3y^5-20x^5y^2z$
$\frac{1}{1-8x^3}$
$4000-1776$
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