Solve (D^2 + 4) y = sin 2x.
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The A.E. is m2 + 4 = 0 i.e., m2 = –4 m = ± 2i C.F. = C1 cos2x + C2sin2x Read more on Sarthaks.com - https://www.sarthaks.com/364477/solve-d-2-4-y-sin-2x
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