Math Help - Logarithm Derivative

1. Logarithm Derivative

I'm looking for the formula to find a Logarithm Derivative.

I need to solve somme questions about that, but I dont know the formula to apply and I cant find it.

2. Originally Posted by AlanaSan
I'm looking for the formula to find a Logarithm Derivative.

I need to solve somme questions about that, but I dont know the formula to apply and I cant find it.
$\frac{d}{dx}\left(\log_a(x)\right)=\frac{1}{x\ln(a )}$