18 X (-2,-1) The diagram shows the curve with equation y = f(x) The coordinates of the minimum point of the curve are (-2, -1) (a) Write down the coordinates of the minimum point of the curve with equation (i) y = f(x-5) y = f(x) The graph of y = a sin(x - b)°+c for -90 < x < 450 is drawn on the grid below. YA 2 I 3 -90 O 90 90 180 270 360 450 x (b) Find the value of a, the value of b and the value of c. b = C= (2) (3) (Total for Question 18 is 5 marks) 21 Turn over​