In Problems 40 and 41, the displacement d (in feet) of an object from its rest position

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In Problems 40 and 41, the displacement d (in feet) of an object from its rest position at time t (in seconds) is given.

(a) Describe the motion of the object.

(b) What is the maximum displacement from its rest position?

(c) What is the time required for one oscillation?

(d) What is the frequency?

d(t) = −2 cos(πt)

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