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Math Help - De Moivre's Theorem

  1. #1
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    De Moivre's Theorem

    Hey guys could someone please help me out? Don't know where to start with this question...

    Show that for Θ E R Re ( e^iΘ/i+e^iΘ) is independent of Θ
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  2. #2
    MHF Contributor

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    Use the fact about complex fractions.
    \Re \left( {\frac{z}<br />
{w}} \right) = \frac{{\Re \left( {z\overline w } \right)}}<br />
{{\left| w \right|^2 }}.

    P.S. You allowed only 12 min. before bumping.
    To bump is against forum rules.
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