设 (x)=pi x+(x)^2 pi leqslant xlt pi 以2π为周期,当f (x)在 [ -pi ,pi ) 上的傅立叶级数为-|||-dfrac ({a)_(0)}(2)+sum _(n=1)^infty ((a)_(n)cos nx+(b)_(n)sin nx) ,则 _(2)= __

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