Error propagation estimation

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Main Question or Discussion Point

I have a physical quantity A defined as $A=(74.5 B^2*(M+N))^{1/3}$

where B, M, N and relative uncertainties are given. And M and N are dependent on B.
Could you show me how to calculate and estimation for the uncertainty on A?

Thanks a lot

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Staff Emeritus
M and N are function of B (ie for example $log M=(0.755 \pm 0.059)*log B+(0.416\pm 0.024)$ The value of B is given by a software, and its uncertainty is 0.0002.