[list][*]f(x)=x[sup]2[/sup]-2x+1[/*][*]We don't need "Plot()" function.[/*][*]We don't need asterisk "*" for multiplication.[/*][*]With Alt+2 (Windows) or Option+2 (Mac), it means the square of ...[/*][*]In some cases, we need circumflex "^" for the n-th power of ...[/*][*]Nice software keyboard with math symbols.[/*][/list]