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December 12th, 2010, 10:32 AM  #1 
Newbie Joined: Dec 2010 Posts: 3 Thanks: 0  Complex Numbers Question PLEASE HELP
[attachment=0:1uzsrvmf]Assignment picture.png[/attachment:1uzsrvmf] Any help would be much appreciated. Thank you. 
December 12th, 2010, 11:57 AM  #2 
Senior Member Joined: Nov 2010 Posts: 502 Thanks: 0  Re: Complex Numbers Question PLEASE HELP
Do you know De Moivre's formula?

December 12th, 2010, 12:53 PM  #3 
Newbie Joined: Dec 2010 Posts: 3 Thanks: 0  Re: Complex Numbers Question PLEASE HELP
(e^j?)^n=e^jn? isnt it? Am i right in thinking i could use this when im square rooting the e ( essentially to the power of 1/2) when i take the modulus, i.e. when i multiply out the first expression and then do z= sqr(x^2+y^2) ? 
December 12th, 2010, 02:06 PM  #4 
Newbie Joined: Dec 2010 Posts: 3 Thanks: 0  Re: Complex Numbers Question PLEASE HELP
hmm its still not working, im thinking i can rearrange sin(?)= 1/2j * (e^j? + e^j?) and make e^j? the subject. However whenever i try this i dont know how you end up with wT/2 in the bracket.

December 16th, 2010, 07:05 AM  #5 
Math Team Joined: Nov 2010 From: Greece, Thessaloniki Posts: 1,989 Thanks: 133 Math Focus: pre pre pre pre pre pre pre pre pre pre pre pre calculus  Re: Complex Numbers Question PLEASE HELP 

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