Neighbors trees extending over property line, can you cut them back to the property line

Neighbors trees extending over property line, can you cut them back to the property line
Just branches or part of the trunk? I think you can trim them back, but you can't damage the tree such that the rest of it falls over, or dies or something similar.
I am not an attorney, and don't play one on TV. Any information given is a description only and should be verified by your attorney.
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