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Differential equations problem

Name: Anonymous 2006-09-20 20:38

y'' + 2y' + 5y = 0

y(t) = ?

Name: Anonymous 2006-09-24 12:08

c(1)exp(-1+i2t) + c(2)exp(-1-i2t) == c(1)exp(-t)cos(2t) + c(2)exp(-t)sin(-2t)

how do you make the left hand side the same as the rhs?

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