Solved: In 9 through 12, find each equilibrium solution
Chapter , Problem 11(choose chapter or problem)
In 9 through 12, find each equilibrium solution x.t / x0 of the given second-order differential equation x00 C f .x; x0 / D 0. Use a computer system or graphing calculator to construct a phase portrait and direction field for the equivalent first-order system x0 D y, y0 D f .x; y/. Thereby ascertain whether the critical point .x0; 0/ looks like a center, a saddle point, or a spiral point of this system.x00 C 3x0 C 4 sin x D 0
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