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10. (Bonus-level question) A spring with natural length 40 cm is pulled out 19 cm and released.
After 4 seconds the amplitude has decreased to 14 cm. The spring oscillates 13 times each
second. Find a cosine function and a sine function that model the length L of the spring/
seconds after the spring was released. (Assume the amplitude of the spring decreases
exponentially.)

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