Given the function f(x)=12. We have to find its derivative using limit process.
By definition of derivative by limit process we have,
Therefore the derivative of 12 is 0.
As per the limit process:-
f'(x) = lim h---> 0 [f(x+h) - f(x)]/h
f(x) = 12
Thus, f(x+h) = 12
f'(x) = lim h---> 0 [12-12]/h = 0