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Math Help - need your help quintuple angle

  1. #1
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    need your help quintuple angle

    Using De-Moivres Theory find

    Cos5θ and Sin5θ


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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by golo102 View Post
    Using De-Moivres Theory find

    Cos5θ and Sin5θ


    de Moivre's theorem says that \cos nx + i~\sin nx = (\cos x + i~\sin x)^n

    can you continue?
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