Mark the tick against the correct answer in the following:
If ω is a complex root of unity then 
To find: Value of 
Formula used: 
= 1
We have, 
On expanding the above along 1st column
⇒ 1 
- 
+ 
⇒
⇒
… (i)
As 
= 1,
⇒ 
⇒ 
Using the above obtained value of 
in eqn. (i)
⇒
⇒ 
⇒ 
⇒ 1 – 1 = 0
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