Chapter 18 
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Section 18.1:SecondOrder Linear Equations
Assignment: 131 odd 
ppt 
bhs (20:36) 
Section 18.2.1:Nonhomogeneous SecondOrder Linear Equations:
Undetermined Coefficients
Assignment: 110 all 
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bhs (#1, 51:31)
bhs (#2, 12:53) 
Section 18.2.2:Nonhomogeneous SecondOrder Linear Equations:
Variation of Parameters
Assignment: 1725 odd 
ppt 
bhs (#1, 23:51)
bhs (#2, 23:51) 
Section 18.3: Applications of Differential Equations: Springs
Assignment: 17 odd 
ppt 
bhs (38:05) 
Section 6.2: Higher Order Linear Differential Equations with
Constant Coefficents
Assignment: 114 all 
ppt 
bhs (38:05) 








