def _(f=input_box(default=2/(x^2+y^2+1),type=SR, label="f(x,y)=", width=35),x0=input_box(default=1,type=SR, label="Point x", width=20), y0=input_box(default=0,type=SR, label="Point y", width=20)):

    
    
    Evaluate
    

        

            
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