Explain, please?

If ω is imaginary cube root of unity, then (a+bω+cω^2)/(c+aω+bω^2)+(c+aω+bω^2)/(a+bω+cω^2)+(b+cω+aω^2)/(b+cω^4+aω^5) is equal to

1. 1

2. -1

3. 0

4. ω

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