Applying variation of parameters to the DE: y" - y = e +e-, we get the following system of equations: uj e + u,e- = 0 u e – uhe- = et +e¯ª What are u1 and u2? (U1 and u2 are functions of x.) -2x O u1 =r - e 2; uz = 4 1 1 -2x. , U2 = 8 %3D 4 U1 8 O u1 = In sin x (e); u2 = sec x (e) = -e"; u2

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