Trisection with straightedge and compass
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See attached pdf file.
The Trig identities you might need are 2cos^2 (x) - cos(2x) - 1=0
and 4cos^3(x) - 3cos(x)=0
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Solution Summary
This shows how to prove that a given angle can be trisected with straightedge and compass and use a trigonometric identity to find polynomials.
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