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http://www.a-levelmathstutor.com/deriv-exp-logs.php Exponential functions Strictly speaking all functions where the variable is in the index are called exponentials. The Exponential function ex
This is the one particular exponential function where 'e' is approximately 2.71828 and the gradient of y= ex at (0,1) is 1.
One other special quality of y= ex is that its derivative is also equal to ex