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**uncertainty in heisenbergs uncertainty principle (urgent)**

This might be a stupid question, but i seem to find different versions of this the more i look. I have a big exam tomorrow, and i have a slight problem. The thing is that our textbook says that Heisenberg's uncertainty principle is

dx x dp (larger or equal to) h

dt x dE (larger or equal to) h

looking through my notes, i find

dx x dp (larger or equal to) h/2pie

dt x dE (larger or equal to) h/2pie

and a search on the internet yield more versions, among them:

dx x dp (larger or equal to) h/4pie

dt x dE (larger or equal to) h/4pie

hmm. could someone please try to explain this discrepancy to me. And please hurry, exam tomorrow

Thanks

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