I Need A Trigonometric Table

Geometry Level 1

sin⁡π2,sin⁡π3,sin⁡π4,sin⁡π5 \large \sin \dfrac\pi2, \quad \sin \dfrac\pi3, \quad \sin \dfrac\pi4, \quad \sin \dfrac\pi5

The above shows all irrational numbers except for one. Which one?

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Chung Kevin by Chung Kevin
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