Came across this question the other day in a class revision exercise:

The height of tides is given by the equation where t is hours after midnight and h is metres.

h(t)=4sin(./6t)

I was able to draw the graph, find the amplitude and period quite easily but could not solve for periods over >1 in terms of height so that a boat would be able to cross the sandbar safely.

So my question is how is it possible to solve the times at which h(t)>1?

## How do you solve values on sin graphs?

Answered## 1 Answer