verify using euler's relations.

use euler's to verify

1. e^ jwt = cos (wt) + jsin(wt)
2. cos(wt)= 1/2 [ e^jwt + e^-jwt]
3. sin(wt)= 1/2j [ e^jwt - e^-jwt]
4. abs( e^jwt)= 1

[Star Strider]

Use the series expansion for and compare it with the series expansion for the other functions.