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Math Help - express in rectangular form

  1. #1
    nunuza
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    express in rectangular form

    Hi all, will you please assist

    z=2cis120

    Nice day all
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  2. #2
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    Hello, nunuza!

    Do you know the meaning of "cis"?


    Express in rectangular form: . z \:=\:2\!\cdot\!\text{cis}(120^o)
    2\!\cdot\!\text{cis}(120^o) \;=\;2\left(\cos120^o + i\sin120^o\right) \;=\;2\left(-\frac{1}{2} + i\frac{\sqrt{3}}{2}\right) \;= \;-1+ i\sqrt{3}

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  3. #3
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    cis's meaning

    Hi SOroban

    I only know it has to do with complex numbers, if u know please share.
    THANX!!
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  4. #4
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by neoza View Post
    Hi SOroban

    I only know it has to do with complex numbers, if u know please share.
    THANX!!
    Actually he already showed you.
    cis( \theta) = cos( \theta) + i sin( \theta)

    -Dan
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