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cos270度等于多少啊

更新时间: 2020-10-28 00:00:00     

0。余弦函数的定义域是指整个实数集,值域是[-1,1]。它是周期函数,其最小正周期为2π。在自变量为2Kπ(为整数)时,该函数有极大值1。

在自变量为(2K+1)π时,该函数有极小值-1。余弦函数是偶函数,其图像关于y轴对称。三角形任何一边的平方等于其他两边平方的和减去这两边与它们夹角的余弦的积的两倍。

关键词: cos270 等于 多少

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