Evaluate
\frac{4e^{2}}{x^{2}+4}
Differentiate w.r.t. x
-8\times \left(\frac{e}{x^{2}+4}\right)^{2}x
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\frac{e^{2}\times 4}{x^{2}+4}
Express e^{2}\times \frac{4}{x^{2}+4} as a single fraction.
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