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If alpha is the complex fifth root of un...

If `alpha` is the complex fifth root of unity, then `|1+alpha + alpha^(2)|`=

A

A) 1+`2 "cos" (2pi)/(5)`

B

B) 1+`2"cos" (pi)/(10)`

C

C) 1+`2"sin"(pi)/(5)`

D

D) 1+`2"sin"(pi)/(10)`

Text Solution

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The correct Answer is:
A
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