Tan 就是正切的意思,直角 三角函数 中,锐角对应的边跟另一条直角边的比 cos 就是 余弦 的意思,锐角相邻的那条直角边与 斜边 的比 sin 就是正弦的意思,锐角对应的边与斜边的边 扩展资. Cos^2 (x) + sin^2 (x) = 1 这个公式被称为三角函数的基本恒等式,它表明任何一个角度的余弦函数平方加上正弦函数平方的值始终等于1。 三角函数对应边关系: sin,称为正弦,sinθ=对边/斜边; cos,称为余弦,cosθ=邻边/斜边; tan,称为正切,tanθ=对边/邻边。 一、正弦 正弦(sine),数学术语,.
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The bible also makes a distinction between a single sin and a practice of sin over an extended period.
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