Sorry about the audio… By the time we found out, we already had thousands of views, and there’s no way to replace the file without youtube thinking it’s a new video. The full-audio video is free at http://www.thattutorguy.com/calculus/limit-definition-of-derivative/

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Free ebook http://tinyurl.com/EngMathYT I discuss and solve an example where the location and nature of critical points of a function of two variables is sought. The method is to calculate the partial derivatives, set them to zero and then solve to find the critical points. The critical points are then classified by employing the 2nd…