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    SHERONDA's Avatar
    SHERONDA Posts: 1, Reputation: 1
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    #1

    Feb 2, 2009, 01:27 PM
    How do I solve
    5cis120 degrees
    Find the 3rd root
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Feb 2, 2009, 01:59 PM

    Finding roots for problems like this is really quite simple -- just remember that . So here you have R = 5, = 120 ,and n = 1/3. Also keep in mind that the angle can also be written as + 360, + 720, etc. so in finding the nth root you will have multiple answers each varying by 360/n degrees from each other. Once you find one root, the other two can be found by adding multiples of 120 degrees. Can you take it from here?
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