These maple release 3 worksheets were part of a Ma 214 differential equations
course I taught using Boyce and DiPrima's text.
They are in cronological order, which was roughly the same as the text.
Many of them are fragmentary in nature, but some are polished.  
Carl Eberhart
Math. Dept., Univ. of Ky.
carl@ms.uky.edu
http://www.ms.uky.edu/~carl