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I know the answer to this integral is 2ipi as it was given but I trying to find out how its 2ipi.

Here is my working

[PLAIN]http://img707.imageshack.us/img707/1681/unledrny.jpg [Broken]

I've been looking at this for ages and I can't work out what i've done wrong

thanks,

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# Homework Help: Integration and log of a complex number

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