Thread: Approximate derivative of x! View Single Post
 2020-05-10, 02:04 #1 othermath     May 2020 1012 Posts Approximate derivative of x! Working experimentally, I found the approach $(x!)'=x!(\frac{x-2}{2(x-1)^2}+lnx)$ For x>2 the approach improves as the value of x increases. I don't know if this is true for very large values ​​of x, (x € R). Can you check it?