Question: Find the general solution to the following complex ordinary differential equations. Verify that, in these cases, the real and imaginary parts of a complex solution

Find the general solution to the following complex ordinary differential equations. Verify that, in these cases, the real and imaginary parts of a complex solution are not real solutions.
(a) u' + iu = 0
(b) u" - iu' + (i - 1)u = 0
(c) u" - iu = 0

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