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给定一个多项式如(a+b*i)*c+i, 其中a, b,c被定义为符号元素来表示三个实数值并且i是虚数单位，如何返回这个多项式的实部和虚部？
(a+b*i)*c+i
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a = sym('a','real'); b = sym('b','real'); c = sym('c','real'); expand(real((a+b*1i)*c+1i))