Let f(x) = ax^2 + bx + c where a,b,c are...

Let `f(x) = ax^2 + bx + c` where `a,b,c` are integers. If `sin\ pi/7 * sin\ (3pi)/7 + sin\ (3pi)/7 * sin\ (5pi)/7 + sin\ (5pi)/7 * sin\ (pi)/7=f(cos\ (pi)/7)`. then find the value of `f(2):`

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