1. derivative of gamma function

hello friends!! I was just wondering, what was the derivative of gamma function?

$\frac{d}{dx}\Gamma(x)=?$

2. Re: derivative of gamma function

$\frac{d}{dx}\Gamma(x)=\Gamma ' (x)=\psi(x) \, \Gamma(x)$

where $\psi(x)$ is the Digamma Function.