OPTION ANGLE DEGREES
DEF f(x)=1/2*x^2
DEF g(x)=1/2*(x+1)^2
DEF q(x)=1/2*(x-1)^2
DEF h(x)=1/2*x^2-1
DEF XX(t)=3*COS(t)
DEF YY(t)=2*SIN(t)+3
SET WINDOW -4,4,-2,6
DRAW grid
FOR x=-4 TO 4 STEP 0.01
   PLOT LINES: x,f(x);
NEXT x
PLOT LINES
SET LINE COLOR 2
FOR x=-4 TO 4 STEP 0.01
   PLOT LINES: x,g(x);
NEXT x
PLOT LINES
SET LINE COLOR 10
FOR x=-4 TO 4 STEP 0.01
   PLOT LINES: x,q(x);
NEXT x
PLOT LINES
SET LINE COLOR 4
FOR x=-4 TO 4 STEP 0.01
   PLOT LINES: x,h(x);
NEXT x
PLOT LINES
SET LINE COLOR 14
FOR t=0 TO 360
   PLOT LINES: XX(t),YY(t);   ! �}��ϐ�
NEXT T
END