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Thread: i want some help for solve this

  1. September 8th 2009, 04:31 AM #1
    fearsking
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    i want some help for solve this





    Last edited by fearsking; September 9th 2009 at 07:13 AM.
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  2. September 9th 2009, 07:16 AM #2
    fearsking
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    any one i can be to choose
    1 or 2 or 3 or 4
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  3. September 10th 2009, 01:06 AM #3
    songoku
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    Hi fearsking

    I think you can start by applying : e^{\alpha\;i}=\cos\;\alpha + i\;\sin\;\alpha
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  4. September 10th 2009, 03:00 AM #4
    fearsking
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    thanx songoku

    i know that but i want second step or solve chooses
    1 or 2 or 3 or 4
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  5. September 10th 2009, 03:05 AM #5
    songoku
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    Hi fearsking

    If you have applied the formula, then you'll have a form of |x + iy|. Find the modulus, then simplifying it using trigonometry identity
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