100  OPTION ANGLE DEGREES
110  DEF f(x)=sin(1.1*x)+sin(0.9*x)
120  SET WINDOW -100,3500,-5,5
130  DRAW GRID(360,1)
140  SET POINT STYLE 1
150  FOR x=-100 TO 3500 
160     PLOT POINTS: x,f(x)
170  NEXT x
180  END
