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Math

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
tan^2X-cot^2X/tanX+cotX=tanX-cotX


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.
[(tanX)^2-(cotX)^2]/[tanX+cotX]=tanX-cotX
or
[(tanX-cotX)(tanX+cotX)]/[tanX+cotX]=tanX-cotX
Can you finish it?

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Lisa

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