| Author | Message | Time |
|---|---|---|
| Yoni | 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? | September 16, 2006, 9:07 PM |
| Maddox | [quote author=Yoni link=topic=15722.msg158215#msg158215 date=1158440861] 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? [/quote] dumb | October 25, 2006, 5:05 AM |