Asked by Lucas

A fish swimming in a lake is modelled by the equation h(t) = 6cos (pi/7 t) where h(t) is the height of the fish above the lake's surface (in meters) at a given time t, in minutes. On the interval 1<=t<=11, when is the fish at the surface of the lake?

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Answered by oobleck
when is cosθ = 0?
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