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​Q25: Question – Paper 1 – June 2018
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25)
Here is a sketch of the graph of      y = cos x      for values of x from 0° to 360°
25 a) cos x = cos 60°
Work out the value of x when     90° ⩽ x ⩽ 360°
[1 mark]

25 b) cos x = – cos 60°
Work out the value of x when     180° ⩽ x ⩽ 360°
[1 mark]