(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Find the domain and the first derivative of 2[arctan(e^x)]

2. Relevant equations

d/dx arctan(x)= 1/(1+x^2)

3. The attempt at a solution

I'm not sure about the domain....

For the derivative:

d/dx 2[arctan(e^x)] = 2 [1/(1+e^x)^2] (e^x)

But my teacher had the same answer excluding the e^x part. Isn't there supposed to be the e^x there since it is the derivative of the inside function?

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# Homework Help: Inverse tan derivative

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