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Trisection with straightedge and compass

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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