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You may find it useful, in the differential equation solver, to use temporary auxi A. If you're going to use arctan, remember about arctan2. 2 Problem 2: Numerical integration and differentiation Define a piece-wise continuous function 1(t): a = dr at a(t) = 0 1(t) = (t - 2) (t)=2 A(t) = 2 exp(-(t - 6)) t