cos与across有什么同学关系cos?

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COS,SIN,TAN之间有什么关系?它们分别是什么边对什么边啊?老是搞不清楚的说!如果哪位能把高一到高3的包含这几个东东的公式写出来再推荐好用又能提高数学成绩的网站,回答非常好的话,可以再加的!
直角三角形 就是有一个90度的角的三角形. 还有两个锐角,就是角度比90度小的角. 斜边就是 那个直角的对边,就是整个三角形中最长的那条边,就是不包括组成直角,剩下的那条边 对边就是这个角的开口方向冲着的那条边,它不是这个角的组成部分. 邻边就是组成这个角的一个边 每个角都是由两条射线组成的,这个知道吧! 那一个锐角来说,它的正弦sin 就是对边比上斜边, 余弦cos,就是它的邻边中的那条直角边比上斜边,就是两条邻边的长度比值,小的比大的! 正切tan,就是对边比上邻边中的那个直角边. 两角和公式 sin(A+B)=sinAcosB+cosAsinB sin(A-B)=sinAcosB-sinBcosA ? cos(A+B)=cosAcosB-sinAsinB cos(A-B)=cosAcosB+sinAsinB tan(A+B)=(tanA+tanB)/(1-tanAtanB) tan(A-B)=(tanA-tanB)/(1+tanAtanB) cot(A+B)=(cotAcotB-1)/(cotB+cotA) ? cot(A-B)=(cotAcotB+1)/(cotB-cotA)倍角公式 tan2A=2tanA/[1-(tanA)^2] cos2a=(cosa)^2-(sina)^2=2(cosa)^2 -1=1-2(sina)^2sin2A=2sinA*cosA三倍角公式sin3a=3sina-4(sina)^3cos3a=4(cosa)^3-3cosatan3a=tana*tan(π/3+a)*tan(π/3-a) 半角公式 sin(A/2)=√((1-cosA)/2) sin(A/2)=-√((1-cosA)/2) cos(A/2)=√((1+cosA)/2) cos(A/2)=-√((1+cosA)/2) tan(A/2)=√((1-cosA)/((1+cosA)) tan(A/2)=-√((1-cosA)/((1+cosA)) cot(A/2)=√((1+cosA)/((1-cosA)) cot(A/2)=-√((1+cosA)/((1-cosA)) ? tan(A/2)=(1-cosA)/sinA=sinA/(1+cosA)和差化积 2sinAcosB=sin(A+B)+sin(A-B) 2cosAsinB=sin(A+B)-sin(A-B) ) 2cosAcosB=cos(A+B)+cos(A-B) -2sinAsinB=cos(A+B)-cos(A-B) sinA+sinB=2sin((A+B)/2)cos((A-B)/2 cosA+cosB=2cos((A+B)/2)sin((A-B)/2) tanA+tanB=sin(A+B)/cosAcosB积化和差公式sin(a)sin(b)=-1/2*[cos(a+b)-cos(a-b)] cos(a)cos(b)=1/2*[cos(a+b)+cos(a-b)] sin(a)cos(b)=1/2*[sin(a+b)+sin(a-b)]诱导公式sin(-a)=-sin(a) cos(-a)=cos(a) sin(pi/2-a)=cos(a) cos(pi/2-a)=sin(a) sin(pi/2+a)=cos(a) cos(pi/2+a)=-sin(a) sin(pi-a)=sin(a) cos(pi-a)=-cos(a) sin(pi+a)=-sin(a) cos(pi+a)=-cos(a) tgA=tanA=sinA/cosA万能公式sin(a)= (2tan(a/2))/(1+tan^2(a/2)) cos(a)= (1-tan^2(a/2))/(1+tan^2(a/2)) tan(a)= (2tan(a/2))/(1-tan^2(a/2))其它公式a*sin(a)+b*cos(a)=sqrt(a^2+b^2)sin(a+c) [其中,tan(c)=b/a] a*sin(a)-b*cos(a)=sqrt(a^2+b^2)cos(a-c) [其中,tan(c)=a/b] 1+sin(a)=(sin(a/2)+cos(a/2))^2 1-sin(a)=(sin(a/2)-cos(a/2))^2其他非重点三角函数csc(a)=1/sin(a) sec(a)=1/cos(a)
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He watched Karl run across the street to Tommy.
他看着卡尔向街对面的汤米跑去。
横跨;横过;穿过
If something is situated or stretched across something else, it is situated or stretched from one side of it to the other.
...the floating bridge across Lake Washington in Seattle...
横跨在西雅图华盛顿湖上的浮桥
He scrawled his name across the bill...
他在账单上草草地签了名。
(放置或覆盖)在…上
If something is lying across an object or place, it is resting on it and partly covering it.
She found her clothes lying across the chair...
她发现自己的衣服堆放在椅子上。
The wind pushed his hair across his face.
他的发丝随风拂面。
在…对过;在…对面
Something that is across something such as a street, river, or area is on the other side of it.
Anyone from the houses across the road could see him...
马路对面房子里的任何一个人都能看见他。
When I saw you across the room I knew I'd met you before.
我在房间那头看见你时就知道我曾见过你。
If you look across at a place, person, or thing, you look towards them.
He glanced across at his sleeping wife...
他朝熟睡的妻子看了一眼。
She rose from the chair and gazed across at him.
她从椅子上站起身,远远地看着他。
(表情展露)在(脸)上
You use across to say that a particular expression is shown on someone's face.
An enormous grin spread across his face...
他咧着大嘴笑了。
For a moment a shadow seemed to pass across Roy's face.
一瞬间罗伊脸上似乎闪过一丝忧伤。
(打)在(脸、头等部位)上
If someone hits you across the face or head, they hit you on that part.
Graham hit him across the face with the gun.
格雷厄姆用枪击打他的脸部。
在…各处;遍及
When something happens across a place or organization, it happens equally everywhere within it.
The film 'Hook' opens across America on December 11...
电影《铁钩船长》12月11日在美国全线上映。
Thousands of farmers from across Europe have held a huge demonstration in the centre of Brussels...
来自欧洲各地的数千农民在布鲁塞尔市中心举行了大规模的示威游行。
超越,跨越(政治、宗教、社会隔阂等)
When something happens across a political, religious, or social barrier, it involves people in different groups.
...parties competing across the political spectrum...
政治纷争中的各党派
We want to promote cosmetics that appeal across the colour barrier.
我们想推销各种肤色的人都喜欢的化妆品。
(测量时)宽…
Across is used in measurements to show the width of something.
This hand-decorated plate measures 30cm across...
这个手绘盘子直径为30厘米。
The snails are no larger than one centimetre across.
这些蜗牛体宽不超过1厘米。
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