SOLUTION: How do you find the exact value of sin 18 degrees in radical form?

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Question 952851: How do you find the exact value of sin 18 degrees in radical form?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
How do you find the exact value of sin 18 degrees in radical form?
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= %28sqrt%285%29+-+1%29%2F4 from Wikipedia, but I don't know how to derive that.