Question: Sketch the graph of the following rational function

1. \(f\left( x \right)=\frac{2x}{{{x}^{2}}-4}\), with \(f''\left( x \right)=\frac{4x\left( 12+{{x}^{2}} \right)}{{{\left( {{x}^{2}}-4 \right)}^{3}}}\)
2. \(f\left( x \right)=\frac{2x}{{{x}^{2}}+1}\), with \(f''\left( x \right)=\frac{4x\left( {{x}^{2}}-3 \right)}{{{\left( {{x}^{2}}+1 \right)}^{3}}}\)

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