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Question no. 21. Of complex number . Question asked in image

Question no. 21.   Of complex number .                                                                                                                                                                                                      Question asked in image

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Grade:11

1 Answers

Arun
25750 Points
5 years ago
Dear student
 
a = cos 2 pi/5 + i sin 2pi/5
 
then 
 
a + a^2 + a^3 + a^4 = (cos 2pi/5 + cos 4pi/5+ cos 6pi/5 + cos 8pi/5) + i  (sin 2pi/5 + sin 4pi/5+ sin 6pi/5 + sin 8 pi/5)
 
now you can solve

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