Do I Need A Trigonometric Table?

Geometry Level 1

cosπ2,cos2π3,cos3π4,cos4π5 \large \cos \dfrac\pi2, \quad \cos \dfrac{2\pi}3, \quad \cos\dfrac{3\pi}4, \quad \cos\dfrac{4\pi}5

All of the above 4 numbers are negative except __________\text{\_\_\_\_\_\_\_\_\_\_} .

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