Welcome 2016! Part 4

Geometry Level 3

cot(10)×cot(30)×cot(50)×cot(70)= ?\large \cot(10^{\circ}) \times \cot(30^{\circ}) \times \cot(50^{\circ}) \times \cot(70^{\circ}) = \ ?

Find the value of above expression.


Image Credit: Wikimedia John Redden.
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