$x^2-2x^2-2$
$\left(3d+4f\right)\left(4f-3d\right)$
$\int\frac{80}{x^2\left(x-2\right)}dx$
$\frac{sin\left(2\left(x-2\right)\right)}{sin\left(x-2\right)}$
$\frac { 3 } { x ^ { 2 } + 3 x }$
$\left(5x+1\right).\left(3x^4+2x^3+x+1\right)$
$x^2-10+21$
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