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September 30, 2014

Homework Help: Trigonometry..

Posted by Lg on Saturday, June 15, 2013 at 4:38pm.

During high tide the water depth in a harbour is 22 m and during low tide it is 10m(Assume a 12h cycle).
Calculate the times at which the water level is at 18m during the first 24 hours.

My solution:
first I found the cos equation: H(t)=-6cos(π/6t)+16
then..
Let π/6t=Θ
18=-6cosΘ+16
18-16=-6cosΘ
Θ=1.230959417


Then I don't know what's next....

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