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Math Help - Complex numbers - express in real and imaginary parts

  1. #1
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    Complex numbers - express in real and imaginary parts

    Hello everyone
    I've got a problem with these two questions:

    Express the following complex numbers in real and imaginary parts :

    z=6ln(1+j)

    z=1/cos^2(1/2 j ln (j))

    I'm completely stuck, any hints will be much appreciated.
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  2. #2
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    Re: Complex numbers - express in real and imaginary parts

    Suppose that

    a+jb \equiv re^{j(\theta+2k\pi)},

    then

    \ln(a+jb) = \ln (r) + j(\theta + 2k\pi).
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  3. #3
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    Re: Complex numbers - express in real and imaginary parts

    Thanks a lot, I've got it sorted now.
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