(Level 1-2) The height, h(t), in centimeters, of a bicycle pedal above the ground at time, t, seconds is a

cosine function of the form h(t) = A cos(bt) + C, where (bt) is measured in degrees.

The graph of this function for 0 s t s 4.3 is shown below.

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h(t) = Acos(bt) + C

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Height of

pedal (cm) 20-

10 –

0+

0

2

4

Time (seconds)Trigonometry