In your notebook, rewrite each sentence in two ways. 1 We know that most mathematical symbols were invented in the 1500s. It is known that most mathematical symbols were invented in the 1500s. Most mathematical symbols are known to have been invented in the 1500s. 2 Historians | Focus 4. Second Edition. Student's Book | 5/106 | Gotowiec

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- It is known that most mathematical symbols were invented in the 1500s.
- Most mathematical symbols are known to have been invented in the 1500s.
- The seventeenth century is regarded as a peak era in the

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