CALCULUS Understanding Its Concepts and Methods
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An exponential function is a function of the form f(x) = ax where a is a positive constant called the base of the function.
The natural exponential function is the inverse of the natural logarithm. It is written as exp x or ex. Thus y = ex means the same as x = ln y.
For a a positive number, the exponential function ax is defined to be ax = ex ln a .
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