Mathematics - Differential Equations for Engineers

The questions coming from this book Notes on Diffy Qs: Differential Equations for Engineers
1. Find particular solution of equation: y'' - 3y' - 4y = 2 sinx
2. Rewrite the second order equation as a system of first order equations using dependent variables
u'' + 1/8u' + u = 0 as a system of first order equations using dependent variables
x1=u and x2=u'

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