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demo1
Valeurs remarquables des sinus et cosinus ⟳
✔ sin (5π/6) = ➡ 1/2
✔ cos (-π/3) = ➡ 1/2
✔ sin (5π/2) = ➡ 1
✔ sin (4π/3) = ➡ -√3 / 2
