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What are you trying to do? If you are just trying to solve a problem that is in your math book, then parentheses will act just as brackets, for example:
[2(1+1)] = 4
(2(1+1)) = 4
These statements are exactly the same to your calculator. Just make sure to complete all of the parenthesis. If you are trying to do something else, from reading the calculator manual I was not able to find support for brackets.
One solution that you might try is to put the scientific numbers in parentheses. For instance open parenthesis, type in the first scientific notation then close parenthesis, next hit the divide key and then open parenthesis and type in the 2nd number in scientific that you are dividing by and then close parenthesis. Hit enter or =. I'm not sure if this will fix your problem, but it is worth a try.
The missing error means that you did not close the parenthesis. When you use a square root or absolute value it always gives you the left parenthesis, (, but you need to close it with a right parenthesis, )