Question: Remove a very small part of an equation


I just got a simple expression after a longer equation where the last number in the expression is very small, and should be se seen as zero.

E[A]+40,0*10^-9, and it should only say E[A]

Is there a simple command to "round away" 40*10^-9?

It has to be simple because it is written in a report.

Best Regards


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