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【中考数学】三角函数要点整理,大小考试必考内容

  • 2026-01-24 12:23:37
【中考数学】三角函数要点整理,大小考试必考内容

1.锐角三角函数
锐角三角函数定义:锐角角A的正弦(sin),余弦(cos)和正切(tan),余切(cot)以及正割(sec),余割(csc)都叫做角A的锐角三角函数。正弦(sin):对边比斜边,即sinA=a/c余弦(cos):邻边比斜边,即cosA=b/c正切(tan):对边比邻边,即tanA=a/b余切(cot):邻边比对边,即cotA=b/a正割(sec):斜边比邻边,即secA=c/b余割(csc):斜边比对边,即cscA=c/a
2.特殊角三角函数值 
3.互余角的关系
sin(π-α)=cosα, cos(π-α)=sinα,tan(π-α)=cotα, cot(π-α)=tanα.
4.平方关系
sin^2(α)+cos^2(α)=1
tan^2(α)+1=sec^2(α)
cot^2(α)+1=csc^2(α)
5.积的关系
sinα=tanα·cosα
cosα=cotα·sinα
tanα=sinα·secα
cotα=cosα·cscα
secα=tanα·cscα
cscα=secα·cotα
6.倒数关系
tanα·cotα=1sinα·cscα=1cosα·secα=1
7.诱导公式
公式一: 设α为任意角,终边相同的角的同一三角函数的值相等:sin(2kπ+α)=sinα k∈zcos(2kπ+α)=cosα k∈ztan(2kπ+α)=tanα k∈zcot(2kπ+α)=cotα k∈z公式二: 设α为任意角,π+α的三角函数值与α的三角函数值之间的关系:sin(π+α)=-sinαcos(π+α)=-cosαtan(π+α)=tanα
8.两角和差公式
(1)sin(A+B)=sinAcosB+cosAsinB
(2)sin(A-B)=sinAcosB-sinBcosA
(3)cos(A+B)=cosAcosB-sinAsinB
(4)cos(A-B)=cosAcosB+sinAsinB
(5)tan(A+B)=(tanA+tanB)/(1-tanAtanB)
(6)tan(A-B)=(tanA-tanB)/(1+tanAtanB)
(7)cot(A+B)=(cotAcotB-1)/(cotB+cotA)
(8)cot(A-B)=(cotAcotB+1)/(cotB-cotA)
除了以上常考的三角函数公式外,掌握下面半角公式,积化和差和万能公式有利于快速解决选择题,达到事半功倍的效果哦!
1.半角公式
注:正负由α/2所在的象限决定。
2.积化和差,和差化积公式
(1)2sinAcosB=sin(A+B)+sin(A-B)
(2)2cosAsinB=sin(A+B)-sin(A-B)
(3)2cosAcosB=cos(A+B)-sin(A-B)
(4)-2sinAsinB=cos(A+B)-cos(A-B)
(5)sinA+sinB=2sin((A+B)/2)cos((A-B)/2)
(6)cosA+cosB=2cos((A+B)/2)sin((A-B)/2)
(7)tanA+tanB=sin(A+B)/cosAcosB
(8)tanA-tanB=sin(A-B)/cosAcosB
3.万能公式
其实三角函数公式数量虽多,但大家只要能够做到理解其含义,公式间是可以相互推导的,当然在考试的时候由于解题时间有限,所以还是要在平时多加练习才能加强记忆哦!
最后送大家一首三角函数记忆口诀,希望每个童鞋都能成功通过“三角函数”这道难关:
三角函数是函数,象限符号坐标注。
函数图象单位圆,周期奇偶增减现。
同角关系很重要,化简证明都需要。
正六边形顶点处,从上到下弦切割;
中心记上数字1,  连结顶点三角形;
向下三角平方和,倒数关系是对角,
顶点任意一函数,等于后面两根除。
诱导公式就是好,负化正后大化小,
变成税角好查表,化简证明少不了。
二的一半整数倍,奇数化余偶不变,
将其后者视锐角,符号原来函数判。
两角和的余弦值,化为单角好求值,
余弦积减正弦积,换角变形众公式。
和差化积须同名,互余角度变名称。
计算证明角先行,注意结构函数名,
保持基本量不变,繁难向着简易变。
逆反原则作指导,升幂降次和差积。
条件等式的证明,方程思想指路明。
万能公式不一般,化为有理式居先。
公式顺用和逆用,变形运用加巧用;
1加余弦想余弦, 1减余弦想正弦,
幂升一次角减半,升幂降次它为范;
三角函数反函数,实质就是求角度,
先求三角函数值,再判角取值范围;
利用直角三角形,形象直观好换名,
简单三角的方程,化为最简求解集。
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  1. CONNECT:[ UseTime:0.000725s ] mysql:host=127.0.0.1;port=3306;dbname=b_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001159s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006469s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004986s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001182s ]
  6. SELECT * FROM `set` [ RunTime:0.006038s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001382s ]
  8. SELECT * FROM `article` WHERE `id` = 468182 LIMIT 1 [ RunTime:0.018308s ]
  9. UPDATE `article` SET `lasttime` = 1770310870 WHERE `id` = 468182 [ RunTime:0.007529s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.014102s ]
  11. SELECT * FROM `article` WHERE `id` < 468182 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.030143s ]
  12. SELECT * FROM `article` WHERE `id` > 468182 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.033843s ]
  13. SELECT * FROM `article` WHERE `id` < 468182 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.179577s ]
  14. SELECT * FROM `article` WHERE `id` < 468182 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.369600s ]
  15. SELECT * FROM `article` WHERE `id` < 468182 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.162455s ]
0.969404s