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January 25, 2015

January 25, 2015

Posted by **Anna** on Wednesday, January 25, 2012 at 8:25pm.

- Calculus-Related Rates -
**bobpursley**, Wednesday, January 25, 2012 at 8:41pmdraw this on grid paper. make theta the angle you are interested in. You know three sides, and the derivative of a couple of those (dx/dt) and dy/dt)..check the diagram.

Now, use the law of cosines:

c^2=a^2+b^2-2ab cosTheta

take the derivative with respect to time.

2c dc/dt= 2a da/dt+2bdb/dt -2

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