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First derivative test

No change in size, 21:45, 6 May 2012
Short version
* In general, if the derivative changes sign as we move from the immediate left of the point to the immediate right of the point, then there is a local extremum at the point. If the derivative has the same sign on the immediate left and immediate right, we ''do not'' get a local extremum at the point.
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==Facts used==
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