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(3) f(x,y)=exp[-(x^2+y^2)]+exp{-[(x+1)^2+(y+1)^2]}+exp{-[(x-1)^2+(y-1)^2]}+exp{-[(x+1)^2+(y-1)^2]}+exp{-[(x-1)^2+(y+1)^2]}

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