The Derivative Song Lyrics

To "there'll be some changes made".

You take a function of x and you call it y,
Take any x-nought that you care to try,
You make a little change and call it delta x,
The corresponding change in y is what you find nex',Tom Lehrer - The Derivative Song - http://motolyrics.com/tom-lehrer/the-derivative-song-lyrics.html
And then you take the quotient and now carefully
Send delta x to zero, and I think you'll see
That what the limit gives us, if our work all checks,
Is what we call dy/dx,
It's just dy/dx.