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Math Help - [SOLVED] contour integratiion\residue theorem ?

  1. #1
    crb
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    [SOLVED] contour integratiion\residue theorem ?

    pleaase have a look at the attched picture.....plz tel me which method is wrong , why? if both r correct...why r the answers different?
    thank u for any help u can provide/...
    Attached Thumbnails Attached Thumbnails [SOLVED] contour integratiion\residue theorem ?-contour-1.jpg  
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  2. #2
    MHF Contributor

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    You haven't finished "method 1". You cite as your answer
    -18\left[e^{4i\pi}- 1\right]+ 2\pi i
    Surely you know that e^{4i\pi}= 1?

    Your two answers are exactly the same.
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  3. #3
    crb
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    oh just had to expand it to sin and cos..............thank you.....
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