$-\frac{1}{4}am-2+\frac{1}{2}am-2$
$\left(2-\sqrt{x+2}\right)^2$
$\left(9x^2y^3-6x^3y^4\right)\left(9x^2y^3+6x^3y^4\right)$
$\int\left(\tan x\right)\left(\sec x+2\right)dx$
$15abc^2+45a^2bc$
$\frac{x^7-1}{x^4+x^2+x+1}$
$2x^2+7x-9$
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