- #1
Saladsamurai
- 3,020
- 7
Homework Statement
I have this mess of an equation:
[tex]
\frac{d\delta}{dx}\int_{y=0}^\delta g\,g'\frac{y}{\delta^2}\,dy +
\frac{d\delta}{dx}\int_{y=0}^\delta g'\frac{y}{\delta^2}\,dy =
g'\frac{1}{\delta}|_{y=0}^\delta
\qquad(1)[/tex]
and I want to change the variable of integration from y to y/δ. Also note that g is a function of the independent variable (y/δ)
Homework Equations
I know that my limits must change from 0 to y into 0 to 1.
The Attempt at a Solution
[tex]
\frac{d\delta}{dx}\int_{y/\delta=0}^1 g\,g'\frac{y}{\delta^2}\,d(y/\delta) +
\frac{d\delta}{dx}\int_{y/\delta=0}^1 g'\frac{y}{\delta^2}\,d(y/\delta) =
g'\frac{1}{\delta}|_{y/\delta=0}^1
\qquad(2)[/tex]Note that in (2), all I did was change the limits and I replaced dy everywhere with d(y/δ).
Is that correct? I feel like I am missing something else here.