正矢
From Wikipedia, the free encyclopedia
From Wikipedia, the free encyclopedia
正矢，割圓術一綫，割圓八綫之一。而正矢函數，三角函數之一，英文versine，數學符號ver，數式寫如。
正矢函數函數假設，割圓半徑為一時，用正角求出正矢綫有幾長。以往會用對數表求查得數值。
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