can i ask if Z= r ( cos X + i sin X), then Z* = r ( cos X - i sin X) or Z* = (1/r) ( cos X - i sin X)

thanks!

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- Oct 25th 2009, 08:31 AMalexandrabel90complex conjugate
can i ask if Z= r ( cos X + i sin X), then Z* = r ( cos X - i sin X) or Z* = (1/r) ( cos X - i sin X)

thanks! - Oct 25th 2009, 09:31 AMutopiaNow
I'm assuming you're asking what the complex conjugate of is? If, so then just remember if , where , then the complex conjugate is simply . So if we have , then if we re-arrange to get it to the form , we see we get . Therefore or is the complex conjugate.

So to sum up complex conjugate of Z= r ( cos X + i sin X) is Z* = r ( cos X - i sin X).