To chop the first 10 lines from a file

tail --lines +10 <FILENAME>

With Diff

I want to Diff 2 files

diff F1 F2

But I need to chop the first 9 lines off each file.

 diff <(tail --lines +9 File1) <(tail --lines +9 File2)

Note there should not be any space between the input '<' and the Parenthesis '('