Well I tried to differentiate a constant
But I never got a whole lot outta that
That’s ’cause differentiation gives the slope
And the slope is nothing if the line is flat.
If a function only has a single value
Then its dee-dee-ex is zero where defined
And conversely if why-prime is always zero
Then why’s the same for all ex in the line.
You can sort of fit it to “Red River Valley” if you like. Not that I ever did. Till now. Alas.