Daylight hours model

Daylight hours model

Secondary 4
TGM Original Questions

Monthly daylight is modelled by \(D=12+1.8\cos\left[\dfrac{\pi}{6}(m-6)\right]\), for \(0\le m\le12\). Find the maximum daylight and the months when \(D=12\).

Solution:

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Answer:Maximum \(13.8\) hours; \(D=12\) at months \(3\) and \(9\).

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