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Math Help - Quotient Rule Problem

  1. #1
    s3a
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    Quotient Rule Problem

    I attached my work as a .pdf file (#17). My work is shown and the final answer from my text book is given. What am I doing wrong and what is the correct way of doing it?

    Any help would be greatly appreciated!
    Thanks in advance!
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  2. #2
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    sorry, your quotient rule use is correct, but you forgot to divide 2 sqrt(r) in the denominator.
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  3. #3
    s3a
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    Which step are you talking about?
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