Is the cosine fixpoint (the solution to the equation $\displaystyle x=\cos x$) rational or irrational, and is it possible to prove it?

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- May 23rd 2009, 07:28 AMespen180Cosine fixpoint
Is the cosine fixpoint (the solution to the equation $\displaystyle x=\cos x$) rational or irrational, and is it possible to prove it?

- May 25th 2009, 01:01 AMGrandadRational or irrational