Auxiliary equations with repeated roots
14:29
Reduction of orders, 2nd order differential equations with variable coefficients
12:59
You probably haven't solved a quartic equation like this before!
22:58
Differential Equations with Repeated Roots: Explained in 3 Ways
16:42
undetermined coefficients, diff eq, sect4.5#19
11:50
Constant Coefficient ODEs: Real & Distinct vs Real & Repeated vs Complex Pair
18:36
This is why you're learning differential equations
19:48
Almost Exact Differential equation & special integrating factor (introduction & example)
1:19:49