Sketch the graph of y=4cos2xy = 4 \cos 2xy=4cos2x for 0≤x≤3π20 \le x \le \frac{3\pi}{2}0≤x≤23π.
The equation 4cos2x=k4 \cos 2x = k4cos2x=k has exactly two solutions for the interval 0≤x≤3π20 \le x \le \frac{3\pi}{2}0≤x≤23π. State the possible values of kkk.
Practise Edexcel A Level Maths Radians with exam-style questions for A Level Maths. 52 questions covering 5.1 Radian Measure, 5.2 Arc Length, 5.3 Areas of Sectors and Segments, 5.4 Solving Trigonometric Equations, and 5.5 Small Angle Approximations, matched to the Edexcel A Level Maths (9MA0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.