How do I figure out a Trigonmentry oscillation problem?

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Question description

I've been stuck on this Trigonometry problem about oscillation

A mass attached to a spring is pulled downward and released. The displacement of the mass from its equilibrium position after t seconds is given by the following function, where d is measured in centimeters (see the figure). The length of the spring when it is shortest is 10 centimeters, and 30 centimeters when it is longest. If the spring oscillates with a frequency of 9/5 Hertz, find d as a function of t. d=A cos w t

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(Top Tutor) Daniel C.
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