How to distinguish between global maxima/minima and local maxima/minima of a function (when the graph is not provided)?
For instance:I find all the points having f'(x)=0 and do second derivative test.But after that suppose the values are such that it will be a tedious job to individually find and compare the extrema values.Is there any other method?
Can someone provide me with few examples? Even a link will do. (Agreed my question is "broad")