roots of a number

minito6

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Apr 17, 2008
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How do I find all the twelfth roots of a number? In particular, the twelfth roots of 1?
 
I am assuming you mean the twelve twelveth roots of unity?.

Writing \(\displaystyle 1=cos(0)+isin(0)\) and use the theorem on nth roots.

we get \(\displaystyle w_{k}=cos(\frac{2{\pi}k}{12})+isin(\frac{2{\pi}k}{12})\)

For k=0, \(\displaystyle cos(0)+isin(0)=1\)

For k=1, \(\displaystyle cos(\frac{2{\pi}}{12})+isin(\frac{2{\pi}}{12})=\frac{\sqrt{3}}{2}+\frac{1}{2}i\)

For k=2, \(\displaystyle cos(\frac{4{\pi}}{12})+isin(\frac{4{\pi}}{12})=\frac{1}{2}+\frac{\sqrt{3}}{2}i\)

And so on, clean up to k=11.
 
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