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December 12th, 2010, 09:32 AM   #1
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Complex Numbers Question PLEASE HELP

[attachment=0:1uzsrvmf]Assignment picture.png[/attachment:1uzsrvmf]

Any help would be much appreciated. Thank you.
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December 12th, 2010, 10:57 AM   #2
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Re: Complex Numbers Question PLEASE HELP

Do you know De Moivre's formula?
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December 12th, 2010, 11:53 AM   #3
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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) ?
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December 12th, 2010, 01:06 PM   #4
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Re: Complex Numbers Question PLEASE HELP

hmm its still not working, im thinking i can re-arrange 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.
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December 16th, 2010, 06:05 AM   #5
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Re: Complex Numbers Question PLEASE HELP



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