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初三三角函数锐角 30°、60°、45° 的 cos、tan、sin 速记技巧，并且不会错的？ 关注者 66 被浏览 Tan (arctanx)等于多少？ 小蓝星 · undefined 来自知友的真实反馈 关注者 请问tan tan x，arc tan（tan x），tan（arc tan x）都是怎么算出来的？ 请问tan tan x，arc tan（tan x），tan（arc tan x）都是怎么算出来的呀？ 详细步骤是怎样的？ 以及为什么 显示全部 关注者 15 被浏览
对于单词sine, cosine, tangent, cotangent, secant, cosecant的由来，这里不讨论，这里讨论的是为什么这些三角函数会有如此中文名称。 首先，先看诱导公式五 \sin\left (\frac {\pi} {2}-x\right)=\cos x\\ \tan\left (\frac {\pi} {2}-x\right)=\cot x\\ \sec\left (\frac {\pi} {2}-x\right)=\csc x\\ 然后再重新叙述一遍初中时学过的余角的定义. 看一眼俄罗斯wiki上的一个说明吧： В западной литературе тангенс, котангенс и косеканс обозначаются {\displaystyle \tan x,\cot x,\csc x} Тригонометрические функции 发布于 2016-10-03 13:44 知乎用户 6 人赞同了该回答 但是由于∠A＝90°，∠B就永远≠90°，只能说越来越接近，而随着x越来越大，这个tan值就会越来越大 我们来想象一下这个极限的情况
为什么计算器上的tan-1次方和实际上1/tan结果不一样？ 如图，具体来说是编程语言理解的问题吗 [图片] [图片] [图片] [图片]
sin是 正弦 sine的简写（也没简化多少），读作 [sain]； cos是 余弦 cosine的简写，读作 [ˈkəʊsaɪn]； tan是 正切 （实际是切线）tangent的简写，读作 [ˈtændʒənt]；（很多中学老师读作“滩金替”） cot是 余切 cotangent的简写，读作 [kəʊ'tændʒənt]。 注意co-前缀表示“相对”的意思，所以有“正”的，就有. 若正切值大于1，可以先取倒数算出tan (π/2-y)，之后按照上述方法求出对应角度，最后记得变换回原角度即可。 上述是我能想到的相对最简便的手动估计反正切函数的方法。 还有sin (arctanx)，tan (arcsinx)， arcsin (tanx)，arctan (sinx)。 十年缺项日经题天天出现，勿随意代值。 少用局部等价无穷小断章取义，哎呦喂。 泰勒公式天下第一要保证精确度适当唉。 重要极限千篇一律取对数LNX。 。 否则所有1^∞型都得1就太**无聊了。
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