Page "Algebraic number" Paragraph 7
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* Trigonometric functions of rational multiples of ( except when undefined ).
For example, each of cos (), cos (), cos () satisfies.
This polynomial is irreducible over the rationals, and so these three cosines are conjugate algebraic numbers.
Likewise, tan (), tan (), tan (), tan () all satisfy the irreducible polynomial, and so are conjugate algebraic integers.
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