[docs] [issue29956] math.exp documentation is misleading

[Mark Dickinson]

Mark Dickinson added the comment:

> Is math.exp(x) always more accurate than math.e ** x?

As Serhiy says: not always, and in general the answer is going to depend on the relative quality of the libm implementations of pow and exp. But on typical machines, it is going to be true that `math.exp(x)` is a better (faster, more accurate) way of computing the exponential function than `math.e ** x`. (Similarly, `math.sqrt(x)` should be preferred over `x ** 0.5`.) I'm not sure whether it's worth encoding such recommendations in the documentation or not.

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<http://bugs.python.org/issue29956>
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