I know $f'(1/2)= 1$ because the professor did that part of the problem in class. But unfortunately I just cannot see the logic to complete the rest of the problem. This problem is supposed to be really easy.
computing derivatives using a given graph
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calculus
derivatives
graphing-functions
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1I had to rollback to include the image link, because the question/answer made no sense without it. – 2012-11-02