; Parabola
:p $12^            ; x^2

; Draw circle
:tp                ; implicit function mode
:p $12^($22^)1m+   ; x^2 + y^2 + (-1)

; Expand range
:tp                ; explicit mode
:spr10,20m,30,40m  ; -20 <= x <= 10, -40 <= y <= 30
:p $1              ; x

; Expand display range
:spd40,40          ; 40x40 (length)
:p $1