どのように and どうやって are both question words used to to ask "how" to do something. But what is the difference between them? Actually, it's rare to see どのように in a written text. Can anyone show me how to use it?
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The only difference between the two phrases is in their formality level.
If you are familiar with the verb やる, you know that it is a casual/conversational verb. やって is a form of やる.
What is the verb that is more formal than やる but has the same meaning? It is する.
Extra: This means that you can say どうして to mean "how" as well, but careful speakers tend to avoid using it because どうして can also mean "why".