L (ab (a + ab)∗ (a + aa)).

I'm sorry, but you didn't provide a specific question related to the regular expression "L (ab (a + ab)∗ (a + aa))". This seems to be a regular expression in formal language theory, used in computer science for string manipulation. If you have a specific question about this regular expression, such as what strings it matches or how it can be simplified, please provide more details.