sin18度等于多少_sin60度等于多少
cos180度、0度、90度,sin180度、0度、90度、还有tan这些都等于多少?
11.5×22.5=258.75平方米1、cos180°=-1,cos0°=1,cos90°=0;
sin18度等于多少_sin60度等于多少
sin18度等于多少_sin60度等于多少
cos165=-cos15
sin180°=0,sin0°=0,sin90°=1;
tan15=sin15/cos15(自己算一下)tan180°=0,tan0°=0,tan90°的值不存在。
2、Y=tanx的图示,当角度为90时,tan为不存在的值。
4、:
常见的三角函数包括正弦函数、余弦函数和正切函数。
cos 180 =-1
cos 0=1
cos 90=0
sin180=0
sin0=0
sin90=1
tan0=0
tan90不存在
tan180=0
cos36度的值是多少?
tan305° = -1.42814800674211; cot305° = -0.70020753820971;1. 知识点定义来源和讲解:
2tan5° = 0.087488663525924; cot5° = 11.4300523027613;. 知识点运用:
余弦函数在几何学、物理学和工程学等领域中有广泛的应用。通过计算余弦值,我们可以求解角度、解决三角形的问题、描述振动的行为等。
3. 知识点例题讲解:
例题: 计算cos36度的值。
解答: 可以通过使用计算器或参考三角函数表来得到cos36度的cos15=(根号6+根号2)/3近似值。计算结果为cos36度 ≈ 0.809016994。
cos 36度的值可以通过三角函数表或计算器来获取。使用计算器的话,可以直接输入"cos(36)",得到近似值。在这里,我将提供一个近似值,约为0.809016994,保留小数点后6位。
cos(36°) 的值可以通过查三角函数表或使用计算器获得。根据三角函数公式,我们可以将 36° 表示为四分之一个周期,即 36° = π/4。因此:
cos(36°) = cos(π/4)
cos(π/4) ≈ 0.7071
所以,cos(36°) ≈ 0.7071。
cos(36°)的值约为0.809。
cos(36度) 的近似值为 0.80902。
约等于0.8090
sin18度26分等于多少
[by1097]等于-0.55三角函数将直角三角形的内角和它的两个边长度的比值相关联,也可以等价地用与单位圆有关的各种线段的长度来定义。5992。
正弦(sine),数学术语,在直角三角形中,任意一锐角A的对边与斜边的比叫正弦函式18度25.5分=sin18.425°=0.316063做角A的正弦,记作sinA(由英语sine一词简写得来),即sinA=角A的对边比斜边。
sin三角函数对照表是什么?
tan135=-tan45下面是一份sin(正弦)三角函数的对照表,显示了常见角度的sin值:
记18°=t角度(度) | 正弦值
设斜边为r,18度角的对边为y--------------------
0 | 0
30 | 0.5
45 | 0.707
60 | 0.866
90 | 1
180 | 0
270 | -1
360 | 0
这个对照表显示了常见角度的sin值,可以用作参考,帮助你在解决三角函数问题时查找角度对应的sin值。需要注意的是,这个表格仅包含一些常见角度的sin值,对于其他角度,可能需要使用计算器或数学软件来求解。
sin是三角函数中的正弦函数。正弦函数的值在圆周上的每个角度处都有一个对应的值。通常,对照表列出了一些常见角度对应的正弦值。
角度(度) 正弦值
0 0
30 0.5
45 0.707
60 0.866
90 1
180 0
270 -1
360 0
这只是一个简单的示例,常见的sin对照表通常会包含更多的角度和对应的正弦值。可以根据需要进行查询或使用计算工具来获取更的值。
sin0=sin0°=0
cos0=cos0°=1
tan0=tan0°=0
sin15=0.650;sin15°=(√6-√2)/4
cos15=-0.759;cos15°=(√6+√2)/4
tan15=-0.855;tan15°=2-√3sin30=-0.988;sin30°=1/2
cos30=0.154;cos30°=√3/2
tan30=-6.405;tan30°=√3/3
sin45=0.851;sin45°=√2/2
tan45=1.620;tan45°=1
cos180°,sin180°,tan180°分别等于多少?怎样求得?
0.4不是特殊角,a=arc sin(0.4)画图求得的!
建立直角坐标,画单位圆
180°角在x负半轴上
所以:
cos180°=-1/1=-1
sin180°=0/1=0
tan180°=0/(-1)=0
答:cos180°=-1
sin180°=0
前面两个是要记住的。后面的可以根据tan=sin/cos求得。其实180°角是常见角,经常会考的,lz还是记住的好
cos180°=-1,sin180°=0,tan180°=0
计算时通过直角坐标系就能计算出来。tan320° = -0.839099631177281; cot320° = -1.175359259421;
sin180°=0
cos180°=-1
ttan100° = -5.67128181961771; cot100° = -0.176326980708465;an180°=0
tan180°=sin180°/cos180°=0/-1=0
不懂请追问,满意请采纳~
cos48度cos18度加in78度sin18度等于多少?
sin35° = 0.573576436351046; cos35° = 0.8152044288992;写错了一个数字噢!
运用公式:cos(a-b)=cosaco+sinasinb。
cos78°cos18°+sin78°sin18°
=c25.5米的圆是多少平‘方os(78°-18°)
=co外墙11.5x25.5的平方是多少s60°
=0.5
三角函数值列个表给我。。谢
这个鞋码都不是完全的,主要是结合鞋子的款型来搭配。上面是废话..表看 给你两个表,个是5°至360°每隔5°的角的正弦、余弦、正切、余切函数的高精度近似值。
第二个是0°、15°、18°、30°、36°、45°、54°、60°、72°、75°、90°这些角的正弦、余弦、正切函数值的数学表达式。其他角的三角函数值的数学表达式一般极其复杂,故未收录。90°以上角的三角函数可借助此表用诱导公式求出。以下是个表:
sin5° = 0.0871557427476582; cos5° = 0.9961946980746;
sin10° = 0.17364817766693; cos10° = 0.984807753012208;
tan10° = 0.176326980708465; cot10° = 5.67128181961771;
tan15° = 0.2679492431123; cot15° = 3.73205080756888;
sin20° = 0.342020143325669; cos20° = 0.939692620785908;
tan20° = 0.363970234266202; cot20° = 2.74747741945462;
sin25° = 0.422618261740699; cos25° = 0.90630778703665;
tan25° = 0.466307658154999; cot25° = 2.14450692050956;
sin30° = 0.5; cos30° = 0.866025403784439;
tan30° = 0.5773502689626; cot30° = 1.73205080756888;
tan35° = 0.70020753820971; cot35° = 1.42814800674211;
sin40° = 0.642787609686539; cos40° = 0.766044443118978;
tan40° = 0.83909963117728; cot40° = 1.175359259421;
sin45° = 0.707106781186547; cos45° = 0.707106781186548;
tan45° = 1; cot45° = 1;
sin50° = 0.766044443118978; cos50° = 0.642787609686539;
sin55° = 0.8152044288992; cos55° = 0.573576436351046;
tan55° = 1.42814800674211; cot55° = 0.70020753820971;
sin60° = 0.866025403784439; cos60° = 0.5;
tan60° = 1.73205080756888; cot60° = 0.5773502689626;
sin65° = 0.90630778703665; cos65° = 0.422618261740699;
tan65° = 2.14450692050956; cot65° = 0.466307658154999;
sin70° = 0.939692620785908; cos70° = 0.342020143325669;
tan70° = 2.74747741945462; cot70° = 0.363970234266202;
sin75° = 0.965925826289068; cos75° = 0.258819045102521;
tan75° = 3.73205080756888; cot75° = 0.2679492431123;
sin80° = 0.984807753012208; cos80° = 0.17364817766693;
tan80° = 5.67128181961771; cot80° = 0.176326980708465;
sin85° = 0.9961946980746; cos85° = 0.0871557427476584;
tan85° = 11.4300523027613; cot85° = 0.0874886635259242;
sin90° = 1; cos90° = 0;
tan90° = ∞; cot90° = 0;
sin95° = 0.9961946980746; cos95° = -0.0871557427476582;
tan95° = -11.4300523027613; cot95° = -0.0874886635259241;
sin100° = 0.984807753012208; cos100° = -0.17364817766693;
sin105° = 0.965925826289068; cos105° = -0.258819045102521;
tan105° = -3.73205080756888; cot105° = -0.2679492431123;
tan110° = -2.74747741945462; cot110° = -0.363970234266202;
sin115° = 0.90630778703665; cos115° = -0.422618261740699;
tan115° = -2.14450692050956; cot115° = -0.466307658154998;
sin120° = 0.866025403784439; cos120° = -0.5;
tan120° = -1.73205080756888; cot120° = -0.5773502689625;
sin125° = 0sin15° = 0.258819045102521; cos15° = 0.965925826289068;.8152044288992; cos125° = -0.573576436351046;
tan125° = -1.42814800674212; cot125° = -0.700207538209709;
sin130° = 0.766044443118978; cos130° = -0.642787609686539;
sin135° = 0.707106781186548; cos135° = -0.707106781186547;
tan135° = -1; cot135° = -1;
sin140° = 0.642787609686539; cos140° = -0.766044443118978;
tan140° = -0.83909963117728; cot140° = -1.175359259421;
sin145° = 0.573576436351046; cos145° = -0.8152044288992;
tan145° = -0.70020753820971; cot145° = -1.42814800674211;
sin150° = 0.5; cos150° = -0.866025403784439;
tan150° = -0.5773502689626; cot150° = -1.73205080756888;
sin155° = 0.4226182617407; cos155° = -0.90630778703665;
tan155° = -0.466307658154999; cot155° = -2.14450692050956;
sin160° = 0.342020143325669; cos160° = -0.939692620785908;
tan160° = -0.363970234266203; cot160° = -2.74747741945462;
sin165° = 0.258819045102521; cos165° = -0.965925826289068;
sin170° = 0.173648177666931; cos170° = -0.984807753012208;
tan170° = -0.176326980708465; cot170° = -5.6712818196177;
sin175° = 0.0871557427476582; cos175° = -0.9961946980746;
tan175° = -0.087488663525924; cot175° = -11.4300523027613;
sin180° = 0; cos180° = -1;
tan180° = 0; cot180° = ∞;
sin185° = -0.0871557427476579; cos185° = -0.9961946980746;
tan185° = 0.0874886635259238; cot185° = 11.4300523027614;
sin190° = -0.17364817766693; cos190° = -0.984807753012208;
tan190° = 0.176326980708465; cot190° = 5.67128181961771;
sin195° = -0.25881904510252; cos195° = -0.965925826289068;
tan195° = 0.2679492431122; cot195° = 3.73205080756888;
sin200° = -0.342020143325669; cos200° = -0.939692620785908;
tan200° = 0.363970234266202; cot200° = 2.74747741945462;
sin205° = -0.422618261740699; cos205° = -0.90630778703665;
tan205° = 0.466307658154998; cot205° = 2.14450692050956;
sin210° = -0.5; cos210° = -0.866025403784439;
tan210° = 0.5773502689626; cot210° = 1.73205080756888;
sin215° = -0.573576436351046; cos215° = -0.8152044288992;
tan215° = 0.700207538209709; cot215° = 1.42814800674212;
sin220° = -0.642787609686539; cos220° = -0.766044443118978;
tan220° = 0.83909963117728; cot220° = 1.175359259421;
sin225° = -0.707106781186547; cos225° = -0.707106781186548;
tan225° = 1; cot225° = 1;
sin230° = -0.766044443118978; cos230° = -0.642787609686539;
tan230° = 1.175359259421; cot230° = 0.83909963117728;
sin235° = -0.8152044288992; cos235° = -0.573576436351046;
tan235° = 1.42814800674211; cot235° = 0.70020753820971;
sin240° = -0.866025403784438; cos240° = -0.5;
tan240° = 1.73205080756888; cot240° = 0.5773502689626;
tan245° = 2.14450692050956; cot245° = 0.466307658154998;
sin° = -0.939692620785908; cos° = -0.342020143325669;
tan° = 2.74747741945462; cot° = 0.363970234266203;
sin255° = -0.965925826289068; cos255° = -0.258819045102521;
tan255° = 3.73205080756888; cot255° = 0.2679492431123;
sin260° = -0.984807753012208; cos260° = -0.17364817766693;
tan260° = 5.67128181961771; cot260° = 0.176326980708465;
sin265° = -0.9961946980746; cos265° = -0.0871557427476582;
tan265° = 11.4300523027613; cot265° = 0.0874886635259241;
sin270° = -1; cos270° = 0;
tan270° = ∞; cot270° = 0;
sin275° = -0.9961946980746; cos275° = 0.0871557427476579;
tan275° = -11.4300523027614; cot275° = -0.0874886635259237;
sin280° = -0.984807753012208; cos280° = 0.17364817766693;
tan280° = -5.67128181961772; cot280° = -0.176326980708465;
sin285° = -0.965925826289068; cos285° = 0.25881904510252;
tan285° = -3.73205080756888; cot285° = -0.2679492431122;
sin290° = -0.939692620785908; cos290° = 0.342020143325669;
tan290° = -2.74747741945462; cot290° = -0.363970234266203;
sin295° = -0.90630778703665; cos295° = 0.422618261740699;
tan295° = -2.14450692050956; cot295° = -0.466307658154998;
sin300° = -0.866025403784439; cos300° = 0.5;
tan300° = -1.73205080756888; cot300° = -0.5773502689626;
sin305° = -0.8152044288992; cos305° = 0.573576436351046;
sin310° = -0.766044443118978; cos310° = 0.642787609686539;
tan310° = -1.175359259421; cot310° = -0.83909963117728;
sin315° = -0.707106781186548; cos315° = 0.707106781186547;
tan315° = -1; cot315° = -1;
sin320° = -0.64278760968654; cos320° = 0.766044443118978;
sin325° = -0.573576436351046; cos325° = 0.8152044288992;
tan325° = -0.70020753820971; cot325° = -1.42814800674211;
sin330° = -0.5; cos330° = 0.866025403784438;
tan330° = -0.5773502689627; cot330° = -1.73205080756887;
sin335° = -0.422618261740699; cos335° = 0.90630778703665;
tan335° = -0.466307658154998; cot335° = -2.14450692050956;
sin340° = -0.342020143325669; cos340° = 0.939692620785908;
sin345° = -0.258819045102521; cos345° = 0.965925826289068;
tan345° = -0.2679492431123; cot345° = -3.73205080756888;
sin350° = -0.17364817766693; cos350° = 0.984807753012208;
tan350° = -0.176326980708465; cot350° = -5.67128181961771;
sin355° = -0.0871557427476583; cos355° = 0.9961946980746;
tan355° = -0.0874886635259241; cot355° = -11.4300523027613;
sin360° = 0; cos360° = 1;
tan360° = 0; cot360° = ∞;
关于第二个表的注释:
“sqrt(x)”表示x的算术平方根,“/”表示除号。
以下是第二个表:
sin0° = 0; cos0° = 1; tan0° = ∞;
tan15° = 2-sqrt(3);
sin18° = [sqrt(5)-1]/4; cos18° = sqrt[10+2sqrt(5)]/4;
sin30° = 1/2; cos30° = sqrt(3)/2;
tan30° = sqrt(3)/3;
sin36° = sqrt[10-2sqrt(5)]/4; cos36° = [sqrt(5)+1]/4;
sin45° = sqrt(2)/2; cos45° = sqrt(2)/2;
tan45° = 1;
sin54° = [sqrt(5)+1]/4; cos54° = sqrt[10-2sqrt(5)]/4;
tan54° = {3sqrt[50-10sqrt(5)]+5sqrt[10-2sqrt(5)]}/20;
sin60° = sqrt(3)/2; cos60° = 1/2;
tan60° = sqrt(3);
sin72° = sqrt[10+2sqrt(5)]/4; cos72° = [sqrt(5)-1]/4;
tan72° = {sqrt[50+10sqrt(5)]+sqrt[10+2sqrt(5)]}/4;
sin75° = [sqrt(6)+sqrt(2)]/4; cos75° = [sqrt(6)-sqrt(2)]/4;
tan75° = 2+sqrt(3);
sin90° = 1; cos90° = 0;
tan90° = ∞;
2-1/,290.,260;3
sin45=根号2/,45,不算特殊角吧;cos15(自己算一下)
sin30=1/那些不用记的啊
只要记住30
45
60
就可以了
其他
考试时是不会考的
因为要用计算器来算
sin0=0
cos0=1
tan0=0
sin15=(根号6-根号2)/,305;2
tan15=sin15/2
1/2
根号3/,30,350这些是特殊角么,其他的都能通过诱导公式算出来
sin
cos
tan
0度
130度
1/2
cos30=根号3/2
-根号3/.;2
-根号3/2
-根号3
150度
1/.
这些要用到sin5和sin10;2
根号3/,335:其实只要熟记下0,60的就足够了;2
cos45=sin45
tan45=1
cos60=sin30
tan60=根号3
sin75=cos15
cos75=sin15
tan75=sin75/,230;2
根号3
90度
1不存在
120度
根号3/2
160度
根号3/2
45度
根号2/?
sin360=sin0
cos360=cos0
tan360=tan0
PS,245.,275;2
根号2/2
tan30=根号3/cos75(自己比一下)
sin90=cos0
cos90=sin0
tan90无意义
sin105=cos15
cos105=-sin15
tan105=-cot15
sin120=cos30
cos120=-sin30
tan120=-tan60
sin135=sin45
cos135=-cos45
sin150=sin30
cos150=-cos30
tan150=-tan30
sin165=sin15
tan165=-tan15
sin180=sin0
cos180=-sin0
tan180=tan0
sin195=-sin15
tan195=tan15
215
那些不用记的啊 只要记住30 45 60 就可以了 其他 考试时是不会考的 因为要用计算器来算
sin0=0
cos0=1
tan0=0
sin15=(根号6-根号2)/2
cos15=(根号6+根号2)/2
sin30=1/2
cos30=根号3/2
tan30=根号3/3
sin45=根号2/2
cos45=sin45
tan45=1
cos60=sin30
tan60=根号3
sin75=cos15
cos75=sin15
tan75=sin75/cos75(自己比一下)
sin90=cos0
cos90=sin0
tan90无意义
sin105=cos15
cos105=-sin15
tan105=-cot15
sin120=cos30
cos120=-sin30
tan120=-tan60
sin135=sin45
cos135=-cos45
sin150=sin30
cos150=-cos30
tan150=-tan30
sin165=sin15
tan165=-tan15
sin180=sin0
cos180=-sin0
tan180=tan0
sin195=-sin15
tan195=tan15
215,230,245,260,275,290,305,335,350这些是特殊角么....
这些要用到sin5和sin10,不算特殊角吧?
sin360=sin0
cos360=cos0
tan360=tan0
PS:其实只要熟记下0,30,45,60的就足够了,其他的都能通过诱导公式算出来
sin cos tan
0度 0 1 0
30度 1/2 根号3/2 根号3/3
45度 根号2/2 根号2/2 1
60度 根号3/2 1/2 根号3
90度 1 0 不存在
120度 根号3/2 -1/2 -根号3
150度 1/2 -根号3/2 -根号3/3
180度 0 -1 0
270度 -1 0 不存在
360度 0 1 0
直角三角形,底边1米,18度角所对的边是多少米
3、常见三角函数角度对应的数值:直角三角形的边分别叫斜边、直角边。
tan50° = 1.175359259421; cot50° = 0.83909963117728;你说底边就不知指哪条边?
sin(30sin18°=y/r
然后sin18°查表。
试求Sin18度的值
40号--25.0 41号--25.5 42号--26.0 43号--26.5则5t=90°
sin3t=cos2t
sin(t+2t)=cos2t
sintcos2t+costsin2t=cos2t
sint(1-2sin²t)+2sint(1-sin²t)=1-2sin²t
记s(y-x)/sin36°=x/sin72°,x/sin36°=y/sin108°=(y-x)/(sin72°-sin36°)int=x,则
x(1-2x²)+2x(1-x²)=1-2x²
(x-1)(4x²+2x-1)=0
x≠1,所以4x²+2x-1=0,取正根得:
x=(√5-1)/4即为sin18°的值。
作内角分别为36°,36°,108°的等腰三角形,设其腰长为x,底边长为cos45=0.525;cos45°=sin45°=√2/2y. 在底边上取一点将底边分为两段,一段等于腰长x,这样大等腰三角形就会被分成两个较小的等腰三角形。
利用正弦定理可得如下等式:
(sin72°-sin36°)/sin36°=sin36°/sin72°
往下利用有关公式即可解出sin18°=根号5-1的四分之一。
sin180度等于多少?
sin245° = -0.90630778703665; cos245° = -0.422618261740699;cos180=-1。建立直角坐标,画单位圆,180°角在x负半轴上,所以cos180°=-1/1=-1,sin180°=0/1=0,tan180°=0/(-1)=0。三角函数的定义三角函数是基本初等函数之一,是以角度为自变量,角度对应任意角终边与单位圆交点坐标或其比值为因变量的函数。三角函数通常定义为包含这个角的直角三角形的两个边的比率,也可以等价的定义为单位圆上的各种线段的长度。更现代的定义把它们表达为无穷级数或特定微分方程的解,允许它们扩展到任意正数和负数值,甚至是复数值。三角函数180度的函数值是多少sin0=0、sin90=1、sin180=0cos0=1、cos90=0、cos180=-1tan0=0、tan90=不存在、tan180=0cot0=不存在、cot90=0、cot180=不存在[j2004]
[duopudz]sin60=cos30
[sz-unis.c o m]
[18ld]
[shsolei.c o m]
tan18° = {3sqrt[50+10sqrt(5)]-5sqrt[10+2sqrt(5)]}/20;[u4221]
[nbgogo.c o m]
[i-go88.c o m]
[kaka2007]
18度坡1米长垂直高度是多少
余弦函数是三角函数中的一种,表示一个角的邻边与斜边的比值。在数学中,角的度数通常用度(°)来表示。cos函数的定义域是实数集,其值域在[-1, 1]之间。co25.5度 = 25度30分s36度表示一个36度角的余弦值。这道题可以在草纸上画出一个角度定义为18度,在一边上以角的交点为起点取单位为1的线段,过线段另一个端点向角的另一边做垂线,垂线长度即为所求。
sin15° = [sqrt(6)-sqrt(2)]/4; cos15° = [sqrt(6)+sqrt(2)]/4;根据直角三角形函数关系18度角的正弦值等于对边与斜边的比值(即垂线与单位1线段的比值),垂线长度等于单位1线段乘以18度的正弦值,也就是1×0.3249=0.3249(18度的正弦值可以查表得出也可以用计算机求出,约0.3249)
所以18度坡1米长垂直高度是0.3249m即32.49厘米
等于0.31米,由题可知,列式计算,坡的斜长是1米,使用三角函数计算,1sin18度=0.31米,是0.31米
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