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The Duffing equation y'' + y + y 3 = 0 is a model for vibrations...

The Duffing equation y'' + y + y 3 = 0 is a model for vibrations of a mass attached to nonlinear spring. Use the vector Euler method with h = 0.2 to approximate the solution at t = 0.6 when the initial conditions are: y(0) = 0, y'(0) = 1.

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