Write a cosine function with given characteristics:

Amplitude = 5

Period = $\displaystyle \frac{{{2}\pi}}{{3}}$ 

Phase Shift = $\displaystyle -\frac{{-{1}\cdot\pi}}{{2}}$ 

Format your answer to look like this: $\displaystyle {A}{\cos{{\left(\omega{\left({x}-\frac{\phi}{\omega}\right)}\right)}}}$ 

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