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Express the general solution of x'=(1, 2, 3, 0, 1, 2, 0, -2, 1)x in terms of real-valued functions. (this is 3x3 matrix, 1, 2, 3 on the left, 0, 1, 2 in the middle, 0, -2 and 1 on the right. I found that the roots are 1, 1+2i, 1-2i. And a=2, b=-3, c=2 for the first root. a=0, b=1, c=i for the second root. a=0, b=-1, c=i for the third root. but how do I get the answer?)