$\frac{\left(x+2\right)\left(2x+4\right)}{-x^2-x-2}$
$x^4-9x^2+16$
$\frac { 5 x ^ { 4 } + 6 x ^ { 3 } + 2 x ^ { 2 } + 3 } { x + 1 }$
$8x^2+y^2=10$
$\left(3-x^2\right)^2$
$x^2-8x+81$
$\left(-12x^3+5x^4+x\right)\left(2x^2+3x-2\right)$
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