4  Maxima and Minima
In this section, we will use the concept of derivatives to calculate the maximum or
minimum values of  various functions In fact, we will find the ‘turning points’ of the
graph of a function and thus find points at which the graph reaches its highest (or
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lowest) locally The knowledge of such points is very useful in sketching the graph of
a given function Further, we will also find the absolute maximum and absolute minimum
of a function that are necessary for the solution of many applied problems