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Mathematics 20 Online
OpenStudy (anonymous):

A pendulum in an antique clock swings above a tabletop. The number of centimeters, C, that the tip of the pendulum is from the tabletop is a function of time, t, in seconds. The function that models the distance of the tip of the pendulum from the tabletop is C(t) = 2(cos 4πt) + 12. How high is the pendulum when t = 1/4 second.

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