Song by
Tom Lehrer to the tune "
There'll be Some Changes Made". Published in
American Mathematical Monthly, 81 (1974). Reproduced here with Tom Lehrer's written permission (see
this node).
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',
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.