100 OPTION ANGLE DEGREES
110 SET VIEWPORT 0.5, 1, 0.5, 1
120 SET WINDOW -4,4,-4,4
130 DRAW GRID
140 FOR x=-4 TO 4 STEP 0.01
150    PLOT LINES:x,x^3-3*x;
160 NEXT x
170 SET VIEWPORT 0,0.5 , 0,0.5
180 SET WINDOW -180,540,-4,4
190 DRAW GRID(90,1)
200 FOR x=-180 TO 540 
210    PLOT LINES:x,SIN(x);
220 NEXT x
230 END
