Lol dude as others have said, differentiating a constant gives you zero. Are you trolling?
I am theorizing that either
1. Trolling
2. Doesn't understand differentiation well
3. Is concerned about the constancy of irrational numbers.
- > In this case, it is reasonable to see where the confusion aroused.
Pi being the irrational value of 3 + 0.1 + 0.04 + 0.001 + 0.0005 + ...
And we do not get any repetition of digits. This can create an illusion that pi is then a variable because we 'do not know' what value it is. However this is the confusion people have with infinite quantities, in the case of pi, it is a constant with an infinite number of digits. As we 'find out' more digits to pi, we arent varying the value we are merely approximating it further. Pi is indeed then a constant.
This probably was not what the OP was thinking, but that can create a source of confusion.