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David Cohen Textbook Questions.
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((-1+i*sqrt(3))/2)+((-1-i*sqrt(3))/2)=-1
-1/2+(i*sqrt(3))/2+-1/2-(i*sqrt(3))/2=-1
-1/2-1/2+(i*sqrt(3))/2-(i*sqrt(3))/2=-1
-1+0=-1
-1=-1