$$G(x) \frac{ 2x }{ { x }^{ 2 } +4 }$$
$\frac{2Gx^{2}}{x^{2}+4}$
$$\frac{G\times 2x}{x^{2}+4}x$$
$$\frac{G\times 2xx}{x^{2}+4}$$
$$\frac{G\times 2x^{2}}{x^{2}+4}$$
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