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1)A piano tuner uses a tuning fork. If middle C has a frequency of 264 vibrations per second, write an equation in the form d=sinw(t) for the simple harmonic motion.

2) Verify the identity

I'm not completely sure on the first one, but I think it looks like
d=sin(264*t) Check your text for a worked example.
The second one is algebra.
Can you finish it?

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