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February 9th, 2019, 03:28 AM   #1
Joined: Jan 2019
From: Athens

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Help with a mathematical proof

I am trying to solve the following problem,


any help will be appreciated.

Last edited by skipjack; February 9th, 2019 at 05:48 AM.
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February 9th, 2019, 03:45 AM   #2
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The definition of the derivative can be written $$F'(y)=\lim_{x \to y} \frac{F(x)-F(y)}{x-y}$$ so what can you say about $|F'(y)|$? Whatever you can say is true for all values of $y$.
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