Hi All, I have the next problem to solve and I am trying to solve it for 2 days with no correct result. I used Chain Rule and I got: but the answer is still not correct. Please someone if can see let me know where is my mistake Thank you
Last edited by Array; May 27th 2012 at 10:19 AM.
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note that $\displaystyle \frac{df}{dt} < 0$ because the distance between the two is decreasing.
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