Added: 1 year ago
From: khanacademy
Views: 37,026
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  • Dear Salman Sir, I believe you have made a miscalculation in this problem while simplifying the derivative of xlnx-(x-1). Thanks for all the videos.....

  • since we did not have to use l' hopital's rule, what were some other ways we could have use to find the answer?

  • I'm in first year of my university, and the Calculus course is usually designed to fail most of the naive first year engineering students... I have a midterm in 20 minutes... I have learned L'Hospital's rule from you in 5 minutes... I still don't get my prof. or textbook -.-

  • @MrInsanelySane good luck man, im taking calc in high school right now and its rough =[

  • lol that's so funny, YAY WE GOT 0/0!

  • 1:24 he tells us to make a 0/0

    its like mom telling you to cause trouble

  • I wish there were more difficult ones to use as examples. I think north of the border there's a little kick up in the difficulty. None the less, fantastic job Sal.

  • can you do stuff like: "Find an equation for the line tangent to y = x2 + 3 at ( -2, 7 )??" and more word problems....? and like continuity, newtons method, more word problems etc...? oh and simple stuff like how to convert into radians like tan^-1(-4) THANKS!

  • A great example where you can use L'Hopital's rule is to justify the evaluation of the indeterminate limit of the intergral of the Dirac function (ODEs playlist).

  • I REALLY want to see the proof.

  • @MrPlender

    You should try to prove it yourself, it's not that hard.

  • Sorry for a stupid question but - why didn't you use the quotient rule on the derivatives?

  • @Ferrus91 When using l'hopital's rule, you take the derivative of the top and bottom separately

  • @TheDrumSpecialist Yeah you do

  • You should get a Nobel for what you've been doing so far! Thanks!

  • first :L

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