Posted by **Lisa** on Monday, October 9, 2006 at 5:53pm.

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?

## Answer this Question

## Related Questions

- Math - A piano tuner uses a tuning fork. If middle C has a frequency of 264 ...
- physics - consider the following: A point on the tip of a tuning fork vibrates ...
- PreCalculus - A piano tuner strikes a tuning fork for note A above middle C and ...
- Physics - Chelsea is tuning a piano when She discovers that G above middle C is ...
- Physics - Piano tuners tune pianos by listening to the beats between the ...
- physics simple harmonic motion - When tuning a piano, a musical play a note that...
- Physics - If a piano tuner hears 3 beats each second when listening to a 8 Hz ...
- physics - Suppose a piano tuner hears 2 beats per second when listening to the ...
- science - 1. A violin string is oscillating at a frequency of 880 Hz (1 Hz = 1 ...
- Physics - A tuning fork has been damaged and its frequency slightly changed. ...