22. A small windmill has its centre 6 m above the ground and blades 2 m in length. In a steady wind, a point P at the tip of one blade makes a complete rotation in 12 s. An equation which models the relationship between the height of the point P above the ground, in metres, at time t, in seconds is h = −2 cos (t) + 6. If 0 ≤ t ≤ 12, what time(s) is point P exactly 7 m above the ground?

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