Diffrential Equations
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I have used the formula for systems of ODE with complex eigenvalues. See the formula at the end of page 2 of the following notes: https://ocw.mit.edu/courses/mathematics/1803scdifferentialequationsfall2011/unitivfirstordersystems/matrixmethodseigenvaluesandnormalmodes/MIT18_03SCF11_s33_7text.pdf
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