Find a function involving the cosine function that models the water depth $\backslash ($ D$($t$)\backslash )($in meters$)$ as a function of time $\backslash ($ t $\backslash )($in hours after midnight$)$ on that day.

$\backslash [$

D$($t$)=$

$\backslash ]$ Find a function involving the cosine function that models the water depth $\backslash ($ D$($t$)\backslash )($in meters$)$ as a function of time $\backslash ($ t $\backslash )($in hours after midnight$)$ on that day.

$\backslash [$

D$($t$)=$

$\backslash ]$