If a=sin\ pi/18 sin\ (5pi)/18 sin\ (7pi)...

If `a=sin\ pi/18 sin\ (5pi)/18 sin\ (7pi)/18,` and `x` is the solution of the equation `y=2[x]+2` and `y=3[x-2],` where `[x]` denotes the integral part of `x` then `a=` (A) `[x]` (B) `1/[x]` (C) `2[x]` (D) `[x]^2`

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