In this case, it's quite convenient to note that the derivative of the numerator and denominator are the same, so that the quotient rule reduces to

This is a sum of terms of the form `x`, where^{-n}`n`= 0, 1, 2, 3. The derivative is then

The derivative of the numerator is zero, so the chain rule reduces to

watko@mit.edu Last modified August 29, 1998