Extrema
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Maxima are a type of extrema or critical number for functions, which can be found with calculus.
The absolute maximum of a function on an interval is either its value at an end point or its value when its first derivative is zero and its second derivative is less than zero.
The relative maximum of a function is when its first derivative is zero and its second derivative is less than zero or, alternatively, its first derivative is positive approaching the point from the left and negative to its right.