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find l when theta is 60 degrees and r is 4.5cm??

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  1. You have to be more specific.
    What is l ?

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  2. hmmm. hard to say what you want, but
    (4.5,60°) translates to 4.5cis60° = 4.5*√3/2 + 4.5*1/2 i = 3.90+2.25i

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