This morning, when I try to calculate the integral using WolframAlpha
int log(tan x) from 0 to pi/4
The result is -C = -0.915966...
My question is: Does this constant C have a name? Is it a well-known constant?
Thank you for your time!
It does, the C stands for Catalan's constant, see here.
When I enter exactly that input into W|A I see, under the "More digits" button on the right, the remark "C is Catalan's constant". Do you get a different result?
You mean the (i) button?
No, I didn't need to use a button to see that. I wonder if different servers are delivering different results (or maybe my input got further in the allotted time).