AP EAMCET · Maths · Complex Number
If then
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
We have, a=cos8π11+isin8π11 Then, a2=cos8π11+isin8π112 =cos16π11+isin16π11 a3=cos24π11+isin24π11 a4=cos32π11+isin32π11 a5=cos40π11+isin40π11 Now, =a+a2+a3+a4+a5…
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