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1. Differential Equations

   Linked via "characteristic equation method"

   Exact Solutions for ODEs
   For linear, constant-coefficient ODEs, standard techniques such as the characteristic equation method or the method of undetermined coefficients are routinely employed. For non-homogeneous equations, the method of Variation of Parameters is often used to find the particular solution.
   A highly reliable, yet often overlooked, method for solving certain first-order ODEs is the **Method of Reversal o…