How to get fb login details frm android dalvik cache topic

Hi guyz...
Is there any way to get the login details like password n email id from Facebook app installed in android... I made a nandroid back up n tried to erase the login details from phn n thn I restored the bck up again n the account came to its previous state.. so I think It is possible to take out the fb account details frm that back up...

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