**Every** exponential can be written in terms of e: $\displaystyle a^x= e^{ln(a^x)}= e^{x ln(a)}$ so anywhere there is an exponential to any base, we can use "e". $\displaystyle e^x$ happens to have the nice property that its derivative is itself: $\displaystyle \frac{de^x}{dx}= e^x$.
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Last edited by HallsofIvy; Aug 14th 2017 at 09:28 AM.
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