Actually, this part of the question is asking you to

*show* how you got the derivative; in particular, to show your use of the specified method. I'm not seeing this here.

This part again asks you to

*show* your work. I'm not seeing this here.

Since you haven't shown your work, there is little for you to compare, contrast, etc, so there is little that can be "concluded". If you had work that could be examined, one might wonder if they're maybe looking for some thoughts on the results, regardless of the method used.

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