10-21-2010, 11:43 AM
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FFR Player
Join Date: Mar 2006
Posts: 3,247
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Re: [High School AP Calc] a few problems
For part 4, differentiate it again implicitly. If you differentiate it successfully, you will be able to replace your dy/dx's with the value of the derivative you got for your normal. Simplify, and you will get a positive or negative result, which will tell you of the curve's concavity at that point.
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