Answer
see graph.
Work Step by Step
Given $y=1-\frac{2}{3}cos(\frac{3}{4}x)$, we can identify its amplitude as $\frac{2}{3}$, period as $p=\frac{2\pi}{3/4}=\frac{8\pi}{3}$, vertical translation as $1$ up, and phase shift as $0$, see graph.
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