Thread: Arctan Derivative Question

1. Arctan Derivative Question

How do I find the derivative of arctan(x/a)? Where "a" is a constant? I know that the derivative of arctan(x) = 1/(1+x^2), but i can't figure out what happens when the variable is divided by a constant. Thanks in advance!

2. Originally Posted by cusseta
How do I find the derivative of arctan(x/a)? Where "a" is a constant? I know that the derivative of arctan(x) = 1/(1+x^2)
Try $\dfrac{\frac{1}{a}}{1+\left(\frac{x}{a}\right)^2}$

3. Thanks for the help!!!!