In this Section we will see how to obtain the derivative of a composite function (often referred to as a ‘function of a function’). To do this we use the chain rule . This rule can be used to obtain the derivatives of functions such as e x 2 + 3 x (the exponential function of a polynomial); sin ( ln x ) (the sine function of the natural logarithm function); x 3 + 4 (the square root function of a polynomial).


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