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Math Help - i want some help for solve this

  1. #1
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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. #2
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    any one i can be to choose
    1 or 2 or 3 or 4
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  3. #3
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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. #4
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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. #5
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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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