Additional Mathematics 0606 / Trigonometry / 3.1073.107: Amplitude and period of cosine0606/11/O/N/25 — Question 1 · 5 marksMark as done · Save for later · Show all solutions(a)Write down the amplitude and period of y=3 cosx2−1y=3\,\mathrm{cos}\dfrac{x}{2}-1y=3cos2x−1.[2]▸ Answer(b)Sketch the graph of y=3 cosx2−1y=3\,\mathrm{cos}\dfrac{x}{2}-1y=3cos2x−1 for 0∘⩽x⩽360∘0^{\circ}\leqslant x\leqslant 360^{\circ}0∘⩽x⩽360∘.[3]▸ Answer▸ Official mark scheme3.108: Equilateral triangle and sec identity →
