Nonlinear Ordinary Differential Equations - Trigonometric Series Solutions solves boundary-value problems involving nonlinear ordinary differential equations of any order. The boundary conditions may also be nonlinear and may involve 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 # of terms, valid in the entire defined interval, with a user-selected period 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 TRIG 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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