Question

Given that z=e^i@. show that z^p + 1/(Z)^p=2cos p@ where p is a positive integer and @ = theta

Answer 1

Are u familiar with the Euler's formula? Check out the link here if u are not: http://en.wikipedia.org/wiki/Euler's_formula

Answer 2

yea, i kno it but dat aint really helping

Answer 3

i tink i see the connection now. tnks

Answer 4

:) good - at first i thought u wanna do the proof 4 Euler formula which is NOT easy lol

Answer 5

haha, ok.