$4^4-4x^3+3x^2+4x-4$
$\frac{2x^3-x^2-9x+4}{x-2}$
$\sqrt[2]{-81}$
$\cos\left(x-3\right)$
$\frac{x^2+11x+28}{x+4}$
$3x+6=2\left(x+4\right)-1$
$\int\left(\frac{3}{x^2}-\frac{2}{x^3}\right)dx$
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