NOTE: The lyrics are to the tune of "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'
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
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