Quote:

Originally Posted by **SaswatPadhi**
Or, if you consider f(x) = x + x + x + x + x i.e. 5x then ...

(1) Yes

(2) Yes

because f'(x) = 5 which is independent of x.

Yes, that was the question.

Next step: if f(x)=x+x+x+x+x and x=5, do you agree or disagree that f'(x)=x?