verify using euler's relations.

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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
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Star Strider
Star Strider 2019-3-1
Use the series expansion for and compare it with the series expansion for the other functions.

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