- #1
Storm Butler
- 78
- 0
Homework Statement
The derivative comes from a step in solving a differential equation from the book differential equations for dummies. (if anyone has the book it is in the second chapter page 27).
d[U(t) y]/dt=U(t) dy/dt+ dU(t) y/dt
Homework Equations
The original differential that was trying to be solved was dy/dt+2y=4 and he was trying to find the integrating factor, i don't know if that helps at all.
The Attempt at a Solution
The reason i don't understand it is because if i were to take the derivative of U(t)*y which I am pretty sure is what it is asking i would think that it would simply be the derivative of U(t) times y (dt/dy= U'(t)*y)