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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 sin (sine) 正弦 cos ( co-sine ) 余弦 tan (tangent) 正切 cot (co-tangent) 余切 sec (secant) 正割 csc (co-secant) 余割 co-前缀有伙伴的意思,比如coworker意为同事,所以上面的可分为三类。正、余分别对应直角三角形除直角外的另外两个角。 反映的是直角三角形,在某一夹角时,各边的比例关系。可通过. 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. 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]
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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 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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