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S343 Section 3.6 Notes- Variation of Parameters 10-11-16  Variation of parameters- general method, can be applied in principle to any equation; no detailed assumptions about form of solution required ′′ ′  Consider + + = () where ,, continuous o Assume general homogeneous solution = + 1 1 ) 2 2( ) o Replace constants ,1 w2th functions 1 re2pectively; determine functions such that = 1 1 (2) sat2sfies original nonhomogeneous ODE ′ ′( ) ( ) ( ) ( ) ′( ) ( ) ( ) ( )