已知集合A={a|(x,y)|x^2+y^2=1}.B={(x,y)|-1已知集合A={a|(x,y)|x^2+y^2=1}.B={(x,y)|-1≤x≤1,-1≤y≤1},则集合N={(x,y)|x=x1+x2,y=y1+y2,(x1,y1)∈A,(x2,y2)∈B}表示的区域面积是

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