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Nice exercise

Started by Yoni, September 16, 2006, 04:07 PM

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Yoni

September 16, 2006, 04:07 PM
http://mathworld.wolfram.com/AlgebraicNumber.html

Prove that if r is a rational number, cos(r * pi) is an algebraic number. What is its degree? What are its conjugates?

Maddox

#1
October 25, 2006, 12:05 AM
Quote from: Yoni on September 16, 2006, 04:07 PM
http://mathworld.wolfram.com/AlgebraicNumber.html

Prove that if r is a rational number, cos(r * pi) is an algebraic number. What is its degree? What are its conjugates?
dumb
asdf.
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