# How do you find the derivative of f(x)=ln(ln(7x))+ln(ln6)?

You can use the Chain Rule for the first $\ln$ while the second is a constant so has derivative equal to zero.
$f ' \left(x\right) = \frac{1}{\ln \left(7 x\right)} \cdot \frac{7}{7 x} = \frac{1}{x} \ln \left(7 x\right)$