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Results can be obtained with the following changes. First, delete the two asterisks at the end of the line ik=ik2 (* if evk>phi*)**, which confuse Mathematica. Second replace DSolve by First@NDSolve (and t by { t, 0, T} in NDSolve), because DSolve cannot solve these equations. Third, change T to .5*(1/fre) to avoid stiffness issues. Then, labeling ...



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