0606 P11 - Nov 2020 - Q2 - 5 marks
8164
(a) Write down the amplitude of \(1+4\cos\frac{x}{3}\).
(b) Write down the period of \(1+4\cos\frac{x}{3}\).
(c) Sketch the graph of \(y=1+4\cos\frac{x}{3}\) for \(-180^\circ\leq x\leq180^\circ\).
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