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Exponential Function
The exponential function, typically written in the form exp(x), raises the
number e to the power x:
For x=0, exp(x) returns the value 1, for positive values of x, exp(x) extends
to infinity and for negative values, it becomes asymptotic with zero as shown in
the graph below:
e to four decimal places is 2.7183 and is derived from the series:
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