Question: Local maxima and minima of piecewise polynomials

Hallo everybody,

I am using maple 8. what is the most efficient way for computing the x-values corresponding to local  maxima and minima of a piecewise polynomial in a single variable x (typically an output of the spline command) over a given interval? I´ve also got another question, how can I extract the individual polynomials from the output of a piecewise function to use them for further computations? Thanks

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