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    If I want to calculate the uncertainty in Z given that Z =2/(A*B)^2, how would I do it? I know the uncertainties in A and B and want to find out the uncertainty in Z. Thank you.
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    Relative uncertainty of A*B is the relative uncertainty of A plus the relative uncertainty of B. You then square the value so that gets multiplied by 2.

    So relative uncertainty of Z is (relative uncertainty of A plus relative uncertainty of B)*2
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    Isn't that the relative uncertainty in Z?
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