If the function (x1(t), y1(t)) = (cost,sin t) is a
Chapter , Problem 21(choose chapter or problem)
If the function (x1(t), y1(t)) = (cost,sin t) is a solution of a first-order autonomoussystem, then the function (x2(t), y2(t)) = ( sin t, cost) is also a solution of thesame system
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