123 Math Vids 
Differential Equations 
Cauchy Euler Equations Time: 30:33 This video is an introduction to solving DE’s in the form of Cauchy Euler Equations. Example problems are included. 
Videos 

Modeling Mixture Problem : *wmv format Time: 16:41 This video solves a mixture problem involving the mixture of two solutions. Separation of variables and integration by partial fractions are demonstrated. 
Variation of Parameters Problem : Time: 13:28 This video solves a 2nd order, linear, nonhomogeneous DE with constant coefficients via variation of parameters. 
Solving a System via Elimination : Time: 13:50 This video solves a system of first order linear DEs using the Elimination method. Two methods are described for finding the solution to the second variable. 
Modeling Spring Position : Time: 17:12 This video discusses how to model the position of a mass attached to a spring with DEs. The simple situation is described and a sample problems is solved. 
Undetermined Coefficients : Time: 14:19 This video discusses how to find a particular solution using the method of undetermined coefficients. 
Slope Field Diagrams : Time: 18:11 This video discusses how to create and use slope field diagrams via hand and mathematica. Autonomous Des are also discussed. 