Trigonometry (1)

Geometry Level 3

cos2π15 cos4π15 cos8π15 cos16π15\large \cos \dfrac{2π}{15} \ \cos \dfrac{4π}{15} \ \cos \dfrac{8π}{15} \ \cos \dfrac{16π}{15}

Find the value of the expression above to 4 decimal places.

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