Ray,
Thanks for the quick reply. Are you saying that your response from Maxima
was
factor(diff(y(x),x)) -> 7*(a*d-b*c)*(a*x+b)^6/(c*x+d)^8
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this ??
Which I agree is exactly what I am looking for. Do you have some
environmental constants set? I get an answer that is quite different.
(480*c*x^6+576*d*x^5+480*c*x^5+600*d*x^4+300*c*x^4+400*d*x^3+72*c*x^3+108*d*
x^2+8*c*x^2+16*d*x-b*c)/(c^2*x^2+2*c*d*x+d^2)
Thanks
Ron