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"On Angles Whose Squared Trigonometric Functions Are Rational."
John H. Conway, Charles Radin, Lorenzo Sadun (1999)
- John H. Conway, Charles Radin, Lorenzo Sadun:
On Angles Whose Squared Trigonometric Functions Are Rational. Discret. Comput. Geom. 22(3): 321-332 (1999)

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