Where are they
hiding the e,
and the ex ?
Start by finding the keys you will be using:
e (to the first power) can be found above
the division key.
ln has its own key on the left side of the
ex is found above the ln
is an irrational number, approximately 2.71828183,
named after the 18th century Swiss mathematician, Leonhard Euler.
f (x) =
called the natural
f (x) = ln x,
is called the natural logarithmic
These two functions are inverses of one another.
When composed, these two
functions return the starting value,
thus creating the identity function, y = x.