February 9th, 2019, 03:28 AM  #1 
Newbie Joined: Jan 2019 From: Athens Posts: 3 Thanks: 0  Help with a mathematical proof
I am trying to solve the following problem, Function.jpg https://drive.google.com/file/d/1LnR...ew?usp=sharing any help will be appreciated. Last edited by skipjack; February 9th, 2019 at 05:48 AM. 
February 9th, 2019, 03:45 AM  #2 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,600 Thanks: 2588 Math Focus: Mainly analysis and algebra 
The definition of the derivative can be written $$F'(y)=\lim_{x \to y} \frac{F(x)F(y)}{xy}$$ so what can you say about $F'(y)$? Whatever you can say is true for all values of $y$.


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