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The displays below shows how the derivative of the exponential function e^x is found by using "differentiation from first principles". This version uses the \delta y, \delta x method, where \delta y means "a small increase in y" and \delta x means "a small increase in x".

This method will NOT be be part of your examination, but is here to give you a chance to see what lies behind the methods you use.

## Summary/Background

The above display makes use of an important factor about the exponential function, namely that, as \delta x \to 0 so \displaystyle \frac{e^{\delta x} - 1}{\delta x} \to 1 .