October 12th, 2017, 05:12 PM  #1 
Newbie Joined: Oct 2017 From: Nowhere Posts: 2 Thanks: 0  Completely Stuck Derivatives
My professor gives us sets of questions to answer and I'm stuck on three of them. Normally I'd just google what to do but I couldn't find anything. Here are the questions with everything given. If someone could just point me in the right direction I'd really appreciate it. Last edited by redArch; October 12th, 2017 at 05:15 PM. 
October 12th, 2017, 05:29 PM  #2 
Senior Member Joined: Sep 2016 From: USA Posts: 218 Thanks: 116 Math Focus: Dynamical systems, analytic function theory, numerics 
1. Take 2 derivatives and evaluate. 2. Compute $\frac{f(x+h)  f(x)}{h}$ using the formula given and apply the property given to take this limit as $h \to 0$. 3. Suppose I told you that this expression was equal to \[ \lim_{h \to 0} \frac{f(a+h)  f(a)}{h} \] for some unknown function and unknown value of $a$. Can you find an $f$ and an $a$ which make this true? This answer won't be unique and in fact there are infinitely many functions which work. But all of them have the same derivative and hence the same limit. 
October 13th, 2017, 07:52 PM  #3 
Newbie Joined: Oct 2017 From: Nowhere Posts: 2 Thanks: 0 
Thanks for the help, I got some of the questions with your help.


Tags 
completely, derivatives, stuck 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
I am always stuck on this last step when I take second derivatives, pls HELP  Azilips  Calculus  5  March 23rd, 2016 07:13 PM 
Completely lost on this  Shamieh  Computer Science  10  September 11th, 2013 09:09 PM 
Factor Completely  mathkid  Calculus  13  November 16th, 2012 07:13 PM 
help! I'm completely stuck.  l0velo  Algebra  4  April 15th, 2011 01:28 AM 
help! im completely stuck.  l0velo  Linear Algebra  1  December 31st, 1969 04:00 PM 