13. Graph at least 2 periods for each function on the grid provided. a ) y = - sin 2 x + + 4 be baitit of the s - X : 0 , 4: sin ( 1 ) + 4:4 4 : 4 2 : 45 9. 1 ( # + 17 ) + 4 y = - sin 4 marks b) y = 4cos3(x -450) 450 90 1350 180 4 marks Page 6 of 8