From Wikipedia, the free encyclopedia
餘切,割圓術一綫,割圓八綫之一。而餘切函數,三角函數之一,英文cotangent,數學符號cot,數式寫如。
餘切函數函數假設,割圓半徑為一時,用正角求出餘切綫有幾長。以往會用對數表求查得數值。
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