$\left(a^2+9\right)\left(a^2-12\right)$
$\left(3a-2x\right)^2$
$z^2-24z+49$
$\frac { 3 x ^ { 4 } - 5 x ^ { 2 } + 2 } { 3 + x ^ { 3 } }$
$\left(\left(\frac{45.33}{1.00104}\right)-1\right)+100$
$\frac{x^2-4}{x-1}$
$\left(4u-5v\right)\left(16u^2-20uv+25v^2\right)$
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