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OCW Scholar - Single Variable Calculus 12 Online
OpenStudy (anonymous):

In solution (c) of the quotient rule practice, I cannot understand the last sentence. What does it mean? ... May be I got. Thank you:)

OpenStudy (anonymous):

It just means that when we gain techniques to figure out what the value of the derivative is at that point then we will be able to prove that the slope of that graph is 0 meaning it is a horizontal line

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