SCREEN 12: CLS WINDOW (-3.5, -13)-(3.5, 10) FOR L = -10 TO 10 STEP .5 FOR I = -3.5 TO 3.5 STEP .1 Y = COS(I + L / 6.5) * L: X = I IF I = -3.5 THEN PSET (X, Y) ELSE LINE -(X, Y) END IF NEXT I NEXT L END