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Math Help - Question regarding polar form of complex numbers

  1. #1
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    Question regarding polar form of complex numbers

    I have difficulty doing this question, if anyone could help that would be greatly appreciated.

    Thx in advance
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  2. #2
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    e^{3i \theta} = (e^{i \theta})^3 = (\cos \theta + i \sin \theta)^3

    so

    \cos(3 \theta) + i \sin(3 \theta) =  (\cos \theta + i \sin \theta)^3.

    Expand the right hand side and equate real and imaginary parts.
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