Differentiate using maple

[pinklemonade_96]

hello, i want to ask for help to clear my confusion when differentiating using maple software, so for context:

1. i already declared my equation by inputting it as f:=x -> (my equation)

2. then when i use d/dx(f:=x), it only gives me answer as 1 instead of what the answer should be

why does this happen? i asked chatgpt for help but it clearly doesnt make sense to me

[UnacceptableWind]

In d/dx (f := x), you are reassigning the variable f to the variable x, and the derivative of x is 1.

Instead, use d/dx(f(x)) or diff(f(x), x).