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Both 'ser' and 'estar' can be translated as 'to be'. So, when you need to use 'to be', you need to ask yourself a question to know which one to use:

Am I talking about the way an object i...

The asymptotes of a curve are the lines or curves that approach a given curve very closely without actually touching it. They make curve sketching much easier. You will probably only have asymptotes that ...