# 2018-06 Product of diagonals

Let $$A_1,A_2,A_3,\ldots,A_n$$ be the vertices of a regular $$n$$-gon on the unit circle. Evaluate $$\prod_{i=2}^n A_1A_i$$. (Here, $$A_1A_i$$ denotes the length of the line segment.)

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