Some solvers allow the user to choose dependent and independent variables. For example, your solver may allow the equation r' = –2sr + e–s, but other solvers will insist that you change variables so that the equation reads y' = –2ty + e–t, or y' = –2xy + e–x, should your solver require t or x as the independent variable. For each of the initial value problems in Exercise, use your solver to plot solution curves over the indicated interval.
r' + xr = cos(2x), r(0) = –3, x ∈ [–4, 4]
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