A Math · Secondary 4 · Hard · Trigonometric models
The height h m of a point on a vertical windmill blade above the ground is modeled by h=6cos(20πt)+18, where t is the time in seconds. Find the two values of t between 0 and 40 for which h=14.
t≈14.6 s,25.4 s
t≈5.4 s,34.6 s
t≈10.0 s,30.0 s
t≈7.3 s,32.7 s
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