$$\frac { 3 + 6 x + 4 x ^ { 2 } - 2 x ^ { 3 } } { x ^ { 2 } ( x ^ { 2 } + 3 ) }$$
$\frac{3+6x+4x^{2}-2x^{3}}{x^{2}\left(x^{2}+3\right)}$
$$\frac{3+6x+4x^{2}-2x^{3}}{x^{4}+3x^{2}}$$
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