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Trigonometry (Period/ Amplitude/ Graph)

(CIE 0606/2020/w/11/Q2)
(a) Write down the amplitude of $1+4\cos \left(\dfrac{x}{3}\right).$
(b) Write down the period of $1+4\cos \left(\dfrac{x}{3}\right).$[1]
(c) On the axes below, sketch the graph of $1+4\cos \left(\dfrac{x}{3}\right)$ for -180°$\le x\le $180°.
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*********math solution*************
(a) Amplitude=4
(b) period=$\dfrac{360}{\frac 13}=360\times 3=1080^{\circ}.$
(c)


**********end math solution********************

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