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Math Help - Complex Exponential Form

  1. #1
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    Complex Exponential Form

    I was asked this question can someone please help I do not know where to start
    Find the sum to n terms:
    a) cosΘ + cos3Θ + cos5Θ + ...

    the answer should be (-cos((2n+1)Θ)+cos((2n-1)Θ))/(2(1 - cos2Θ))

    I don't know hoe to go about answering this question.
    Please Help
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by sthato View Post
    I was asked this question can someone please help I do not know where to start
    Find the sum to n terms:
    a) cosΘ + cos3Θ + cos5Θ + ...

    the answer should be (-cos((2n+1)Θ)+cos((2n-1)Θ))/(2(1 - cos2Θ))

    I don't know hoe to go about answering this question.
    Please Help
    Start by observing that you have a finite geometric series.

    CB
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  3. #3
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    I have noticed that, but I still don't know how to go about answering the question.
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