Posted by Dave on Friday, February 11, 2011 at 7:27pm.
d/dx (x)(e^xy)(cos2x).
Product rule lets me take the derivative of f(x)g(x). But three functions?

Diffeq  Tyler, Friday, February 5, 2016 at 9:28am
(e^xy)cos(2x)+x(y)e^xy(cos2x)(2x)(e^xy)sin2x