I'm having trouble with differentiating this properly...
Let be a solution of ,
Show that for constants a, , the function
, satisfies .
I know I have to use chain rule, but I'm having trouble with the notation.
This is what I thought I should do:
Let , and
But for , I end up with
If the and weren't there, I could say it works for k = 1, but I don't think I can just make those notation just "disappear."
How do I write this out properly, so that the solution is verified?