Target Mathematics

1.20: Cosine graph sketch, amplitude and period

0606/12/O/N/19 — Question 1 · 5 marks

(i)
On the axes below, sketch the graph of y=2cos⁡3x−1y = 2\cos 3x - 1 for −90∘≤x≤90∘-90^{\circ} \le x \le 90^{\circ}.
[3]
(ii)
Write down the amplitude of 2cos⁡3x−12\cos 3x - 1.
[1]
(iii)
Write down the period of 2cos⁡3x−12\cos 3x - 1.
[1]