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parenthesis ( )square brackets [ ]curly brackets { }
A pair of parenthesis () are put around a particular part of an equation to indicate that you do that step first.
Grouping symbols? parenthesis (), brackets [], the fraction line itself if written horizontally (not at a slant), any radical (square or cube root etc.)
Grouping symbols are symbols such as parentheses or brackets, that indicate that the operations within them should be done first. When an expression contains more than one pair of grouping symbols, the computations in the innermost grouping should be done first.
to indicate that it is a set . a set can be arrange in any ways.. and the parenthesis indicates an ordered pair. it cant be interchande because it corresponds to a point..