Part B - Thinking and Investigation Full marks will be given only for if all steps are shown

[TI- 15 marks]

1. Solve cos 2x-2 sinx-cos²x = -3 on the interval x = [0, 2x].✓✓✓✓

2. A grandfather clock shows a time of 7 o'clock. What is the exact radian measure of the angle between the hour

hand and the minute hand? ✓✓✓