Besonderhede van voorbeeld: -2716063576638529095

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Author: QED

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English[en]
Why is that? Well, if I rotate something by 90° and then I rotate by 90° again, then I will rotate by 180�.
Korean[ko]
내가 만약 90도를 회전시키고 그것을 또다시 90도 회전시키면 나는 180도를 회전시키는 것이 됩니다.

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