Additional Mathematics 0606 / Trigonometry / 1.201.20: Cosine graph sketch, amplitude and period0606/12/O/N/19 — Question 1 · 5 marksMark as done · Save for later · Show all solutions(i)On the axes below, sketch the graph of y=2cos3x−1y = 2\cos 3x - 1y=2cos3x−1 for −90∘≤x≤90∘-90^{\circ} \le x \le 90^{\circ}−90∘≤x≤90∘.[3]▸ Answer(ii)Write down the amplitude of 2cos3x−12\cos 3x - 12cos3x−1.[1]▸ Answer(iii)Write down the period of 2cos3x−12\cos 3x - 12cos3x−1.[1]▸ Answer▸ Official mark scheme← 2.27: Sec–tan quadratic and sine equation1.32: Cosine graph sketch, amplitude and period →
