(a) Copy and complete the table of the relation \(y = 2\sin x - \cos 2x\).
x
0°
30°
60°
90°
120°
150°
180°
y
0.5
-1.0
Using a scale of 2 cm to 30° on the x- axis and 2 cm to 0.5 unit on the y- axis, draw the graph of \(y = 2\sin x - \cos 2x\), for \(0° \leq x \leq 180°\). (b) Using the same axes, draw the graph of \(y = 1.25\). (c) Use your graphs to find the : (i) values of x for which \(2\sin x - \cos 2x = 0\) ; (ii) the roots of the equation \(2\sin x - \cos 2x = 1.25\).
