Answer

1. The only important difference is that the dyadic arithmetic operators are infix symbols, which means that they are written between their arguments. Functions are written as prefix symbols, which means that they are written in front of their arguments. The arguments must be placed in parentheses and separated by commas.

2. A superficial difference is that * (for example) takes two arguments, whereas SQRT takes only one. But there are other intrinsic functions that take two arguments, and a few that take more than two.

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