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Math Help - Complex Numbers

  1. #1
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    Question Complex Numbers

    This is a thread for complex number problems in applied mathematics.

    You can see attachment for the question.
    Attached Thumbnails Attached Thumbnails Complex Numbers-image0319.jpg  
    Last edited by anil86; November 3rd 2013 at 06:50 AM.
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  2. #2
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    Re: Complex Numbers

    What help do you need? What do you have so far? For the first one, I would start with multiplying out by 2(1-\cos \theta) and see what you get (consider the sum or difference of angles formula for cosine).

    For the second problem, again, I would start with the difference of angles formula for cosine.
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  3. #3
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    Re: Complex Numbers

    Thanks for your time.
    I tried that but can't get the solution. Can you solve & illustrate it to me?
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  4. #4
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    Re: Complex Numbers

    Show your work and we can help you figure out where you are going wrong. To type in your answer, use [tex] tags around any mathematics.
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    Re: Complex Numbers

    Thanks for replies. I got the solution.
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  6. #6
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    Exclamation Re: Complex Numbers

    Solve equations using De Moivre's theorem:

    1. x^7 + x^4 + x^3 + 1 = 0

    2. x^7 - x^4 + x^3 - 1 = 0


    I tried multiplying with (x - 1). Also tried putting x^3 = y; didn't work.
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  7. #7
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    Re: Complex Numbers

    Please put new questions in a new thread.

    -Dan
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