1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Could it be impossible to find derivative by basic definition?

  1. May 19, 2014 #1
    (I am sorry, totally forgot about solving quadratic equations, close the topic please)

    1. The problem statement, all variables and given/known data

    Finding derivative of the equation like F(x) = 5x / (1+x^2) by definition (ƒ(a+h) - f (a))/h is easy (point 2;2), but I got really stuck in finding a way to solve it by basic definition ( f(y) - f(a) )/( x - a ) :(

    It seems to me there are much more such equations. Is there any way to do it?
     
    Last edited: May 19, 2014
  2. jcsd
  3. May 19, 2014 #2

    adjacent

    User Avatar
    Gold Member

    Isn't that the same thing?
    As far as I know, the basic definition of derivative is:
    23b7112ec7aa5d19157cf84bd3b392e8.png
     
  4. May 19, 2014 #3
    The same, I just had difficulties with canceling equation derived from y - y1 / x - x1, because I totally forgot about solving quadratic equations:( It seemed strange to me on that moment that I could solve the (f(h) - f(a)) / a, but not another form:) Close the topic please.
     
  5. May 19, 2014 #4
    Topics are not closed without a good reason.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Could it be impossible to find derivative by basic definition?
Loading...