#### Problem Statement: ME Board April 1997

What is the first derivative of the expression (xy)x = e?

- A. 0
- B. x/y
- C. –y [(1 + ln xy) / x)]
- D. –y [(1 – ln xy) / x2)]

#### Problem Answer:

The derivative is equal to **–y[(1 + ln xy)/x)]**

Solution:

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