Question 5 The curve, y = a cos Given that the amplitude of y is 5 and that the period of y is 720°. (a) State the value of a and of b. (b) Given that the minimum value of y is -7, state the value of c. (c) Sketch the graph of y, indicating clearly the coordinates of any maximum or minimum points on the graph. +c is defined for 0° ≤x≤720°, where a, b and c are integers. (d) State the range of values of k for which the equation a cos ( 1 ) + 0 = b +c=k has 2 unique solutions.

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