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

Find the derivative of arctan(6x).

2. Relevant equations

3. The attempt at a solution

Ok, I know the derivative of arctan(x) is 1/(x^2 + 1).

So I am trying to make the substitution u = 6x.

Then the derivative of arctan(u) should be 1/(u^2 + 1)... and therefore 1/(36x^2 +1).

But that's not right... what am I doing wrong?

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# Find the derivative of arctan(6x)

**Physics Forums | Science Articles, Homework Help, Discussion**