Question

What is the derivative of `x=1`?

Answer 1

The derivative with respect to what variable?

Explanation:

The derivative with respect to `x` requires a function of `x` in its definition.

`x=1` does not describe a function of `x`. So it is not possible to give a definition of the derivative with respect to `x`. (It does not exist.)

If we think of it as a function of some other variable `t`, we can say `d/dt(x) = d/dt(1) = d/dt(0t+1) = 0`