单词	unit circle
释义	unit circle noun : a circle having a radius of 1 Example Sentences Recent Examples on the Web Some may fall inside the unit circle, others right on it, and still others outside it. Quanta Magazine, 14 May 2020 Since going a distance π takes you halfway around the unit circle, cos(π)=-1 and sin(π)=0, so eiπ=-1. Lorenzo Sadun, Slate Magazine, 14 Mar. 2017 Word History First Known Use 1852, in the meaning defined above
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