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cos多少度等于8分之3

更新时间: 2020-10-28 00:00:00     

约60度。余弦函数是三角函数的一种。在Rt△ABC中,∠C=90°,∠A的余弦是它的邻边比三角形的斜边,即cosA=b/c。

三角形任一边的平方等于其他两边平方和减去这两边与它们夹角的余弦的积的两倍。余弦定理亦称第二余弦定理。

关键词: cos 多少 等于 分之

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