(a) Construct the graph of 2cos 3x + 1 in the range 0 ^ 0 <= x <= 120 ^ 0 at intervals of 15 ^ 0
(b) Use your graph to find:
(i) the maximum value of y;
(ii) the minimum value of y;
(iii) the value(s) of x at which
2cos 3x + 1 = 0
![a Construct the graph of 2cos 3x 1 in the range 0 0 lt x lt 120 0 at intervals of 15 0b Use your graph to findi the maximum value of yii the minimum value of y class=](https://us-static.z-dn.net/files/dbc/017b3c7729ef3cbcb553ac954ab65683.jpg)