Complex nos.

  • Thread starter NEILS BOHR
  • Start date
  • #1
79
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Homework Statement


Let alpha = e ^ i8pi / 11 , then find Re ( alpha + alpha ^2 + alpha ^3 + alpha ^4 + alpha ^5).


Homework Equations





The Attempt at a Solution


look i hav reduced the expression to [tex]\alpha[/tex] ([tex]\alpha^5[/tex] -1 ) / [tex]\alpha[/tex]-1

now what to do??:confused:
 

Answers and Replies

  • #2
4
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Have you tried using Euler's formula:
e^ix = cosx + isinx
 

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