The brackets around the x meant to take only the fractional part of x.
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Square brackets are used inside regular parentheses, in a sentence.
Use parentheses, then brackets, then parentheses, then brackets, and so on. Word (word [word], word [word (word)])
Samantha broke two of the five brackets on her teeth.
use the word rigorousness in a sentence
E.g. "How do you use the word plentiful in a sentence?"