## Answers

#### Explanation:

For this problem, you would use the chain rule. You can pull the 23 "out" to the front as it is a constant multiple. Your setup would look like

*Note: the derivative of #arctan(x)# is #1/(1+x^2)#.*

*So, taking the derivative of #arctan(sqrt(x))# would look like #1/(sqrt(x)^2+1)#.*

You then apply the chain rule and multiply

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