2026 IGCSE Additional Mathematics May/June 0606/21 Q2

2026 IGCSE Additional Mathematics May/June 0606/21 Q2

7 marks
  1. Write down the amplitude of \(4\cos\left(\dfrac x8\right)+2\).[1]
  2. Write down the period, in degrees, of \(4\cos\left(\dfrac x8\right)+2\).[1]
  3. Solve the equation \(4\cos\left(\dfrac x8\right)+2=0\) for \(-1080^\circ\le x\le1080^\circ\).[3]
  4. On the axes sketch the graph of \(y=4\cos\left(\dfrac x8\right)+2\) for \(-1080^\circ\le x\le1080^\circ\).[2]

Solution:

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Answer:(a) \(4\) (b) \(2880^\circ\) (c) \(x=\pm960^\circ\) (d) Sketch shown.

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