Solves boundary-value problems involving linear ordinary differential equations of any order, with variable coefficients. The boundary conditions may also be equations involving the unknown function and its derivatives, and the evaluation point may be different for each one. The solution produced is a continuous function in the form of a finite trigonometric series of user-specified number of terms and period, valid in the entire defined interval and expanded about a user-chosen center of expansion. The solution may be stored in a file which may be later read by a suitable program (like POWER AND TRIGONOMETRIC SERIES) to further study it to find its roots, maxima and minima, derivatives, integral, graph. You may predefine constants. Handles a wide variety of functions, including trigonometric and hyperbolic functions. Results can be saved or printed. Includes a help file with instructions, examples and methodology.

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