If and are funtions of , does equal ?

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- February 3rd 2010, 07:46 AMwglmbDouble differential / differential squared
If and are funtions of , does equal ?

- February 3rd 2010, 08:11 AMHallsofIvy
- February 3rd 2010, 08:20 AMwglmb
Thanks a lot :)

- February 3rd 2010, 03:51 PMJester