Additional Mathematics 0606 / Trigonometry / 3.93.9: Amplitude, period and sketch of cosine0606/12/F/M/24 — Question 1 · 5 marksMark as done · Save for later · Show all solutionsGiven that y=2+4 cos 3θy = 2 + 4\,\mathrm{cos}\,3\thetay=2+4cos3θ for −120∘⩽θ⩽120∘-120^{\circ} \leqslant \theta \leqslant 120^{\circ}−120∘⩽θ⩽120∘,(a)write down the amplitude of yyy.[1]▸ Answer(b)write down the period of yyy.[1]▸ Answer(c)On the axes, sketch the graph of yyy.[3]▸ Answer▸ Official mark scheme← 3.52: Curve from second derivative involving cosine3.10: Polynomial factors then cosec equation →
