GraphingCalculator 3.2;
Window 46 6 758 646;
PaneDivider 221;
Slider 0 20;
SliderSteps 20;
SliderControlValue 0;
2D.BottomLeft -3.03125 -3.765625;
Expr y=1/(1+x^2);
Color 2;
Expr y=sum([-1]^k*x^(2*k),k=0,n);