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Lec 4 | MIT 18.01 Single Variable Calculus, Fall 2007

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Uploaded by on Jan 16, 2009

Chain rule

Higher derivatives

View the complete course at: http://ocw.mit.edu/18-01F06

License: Creative Commons BY-NC-SA
More information at http://ocw.mit.edu/terms
More courses at http://ocw.mit.edu

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  • I've just noticed that my teacher never taught me the entire steps...just the short cuts. This is great!

  • Thanks for this MIT - a great aid for me.

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  • @prantare Because delta v represents the change of the value of v from the original v(x) value (in other words, delta v = "new" v - "old" v). As delta x goes to zero, "new" v and "old" v become the same (if v is continuous at this "old" v value, by the definition of continuity), and therefore the delta v approaches zero. Make sense?

  • @MegaPukpui No. It will work for the proof because when lim x->0 the proof is correct. So for derivatives, it's fine if you write that way, but otherwise the mathematical proof is wrong as it won't equate for limits other than 0.

    If I'm not clear enough, you are dropping a u.deltax in the proof from thin air. Remember whatever change you make to the formula, it must equate the previous formula, and it will only equate when u.deltax = 0, that is, when lim x->0.

  • Cool video

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