A Math · Secondary 4 · Hard · Trigonometric models
The function h is given by h(t)=8cos(20πt)+12, where t is the time in minutes after noon and h is the height of a buoy above the seabed in metres. Find all values of t in the first hour after noon for which h=10.
t≈11.6 min,28.4 min,51.6 min
t≈8.4 min,31.6 min
t≈11.6 min,48.4 min
t≈3.2 min,56.8 min
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