Excerpt from 3-D Schrodinger Eqaution...I'm stuck...

I'm solving the Three Dimensional Schrodinger Equation, and there is a little part that I'm stuck on...

I'm starting with this DE:

http://img.photobucket.com/albums/v4...e2143a3-12.jpg

and I have to show that if I change the independent variable from theta to z, using the substitution

http://img.photobucket.com/albums/v4...e2143a3-13.jpg

and the identity

http://img.photobucket.com/albums/v4...e2143a3-14.jpg

I should show that the DE has the form:

http://img.photobucket.com/albums/v4...e2143a3-15.jpg

My problem is going from:

http://img.photobucket.com/albums/v4...e2143a3-16.jpg

I'm probably overlooking something pretty minor, but I'd appreciate any help! (Sun)

--Chris