They smiled at each other.
They smiled at one another.
Are these synonymous?
Which one is more used?
Is one of them more formal than the other?
They smiled at each other. They smiled at one another. Are these synonymous?
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They smiled at each other.
They smiled at one another.
Are these synonymous? Yes
Which one is more used? #1, in my experience.
Is one of them more formal than the other? #2, I'd say.
Clive