$9t^2-72t+144$
$4cos^2x-4cosx+1$
$x^{15}-27$
$\int\frac{2x^2-5x-18}{x^3+x^2+6x}dx$
$\left(6m^3y+3z\right)\left(6m^3y-3z\right)$
$\frac{dy}{dx}\left(x^2+2xy+y^2-2y+9\right)$
$- 4 x ^ { 3 } ( 2 x ^ { 2 } - 9 x )$
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