最最完整版--三角函数公式大全 最全三角函数公式？
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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
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sin(a+b)=sin(a)cos(b)+cos(\u03b1)sin(b)
cos(a+b)=cos(a)cos(b)-sin(a)sin(b)
sin(a-b)=sin(a)cos(b)-cos(a)sin(b)
cos(a-b)=cos(a)cos(b)+sin(a)sin(b)
tan(a+b)=(tan(a)+tan(b))/(1-tan(a)tan(b))
tan(a-b)=(tan(a)-tan(b))/(1+tan(a)tan(b))
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sin(a)+sin(b)=2sin((a+b)/2)cos((a-b)/2)
sin(a)−sin(b)=2cos((a+b)/2)sin((a-b)/2)
cos(a)+cos(b)=2cos((a+b)/2)cos((a-b)/2)
cos(a)-cos(b)=-2sin((a+b)/2)sin((a-b)/2)
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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)]
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sin(2a)=2sin(a)cos(a)
cos(2a)=cos^2(a)-sin^2(a)=2cos^2(a)-1=1-2sin^2(a)
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sin^2(a/2)=(1-cos(a))/2
cos^2(a/2)=(1+cos(a))/2
tan(a/2)=(1-cos(a))/sin(a)=sin(a)/(1+cos(a))
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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))
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a*sin(a)+b*cos(a)=sqrt(a^2+b^2)sin(a+c)
[\u5176\u4e2d\uff0ctan(c)=b/a]
a*sin(a)-b*cos(a)=sqrt(a^2+b^2)cos(a-c)
[\u5176\u4e2d\uff0ctan(c)=a/b]
1+sin(a)=(sin(a/2)+cos(a/2))^2
1-sin(a)=(sin(a/2)-cos(a/2))^2
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csc(a)=1/sin(a)
sec(a)=1/cos(a)
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sinh(a)=(e^a-e^(-a))/2
cosh(a)=(e^a+e^(-a))/2
tgh(a)=sinh(a)/cosh(a)
一、倍角公式
1、Sin2A=2SinA*CosA
2、Cos2A=CosA^2-SinA^2=1-2SinA^2=2CosA^2-1
3、tan2A=（2tanA）/（1-tanA^2）（注：SinA^2 是sinA的平方 sin2（A） ）
二、降幂公式
1、sin^2(α)=(1-cos(2α))/2=versin(2α)/2
2、2cos^2(α)=(1+cos(2α))/2=covers(2α)/2
3、tan^2(α)=(1-cos(2α))/(1+cos(2α))
三、推导公式
1、1tanα+cotα=2/sin2α
2、tanα-cotα=-2cot2α
3、1+cos2α=2cos^2α
4、、4-cos2α=2sin^2α
5、1+sinα=(sinα/2+cosα/2)^2=2sina(1-sin2a)+(1-2sin2a)sina
四、两角和差
1、1cos(α+β)=cosα·cosβ-sinα·sinβ
2、cos(α-β)=cosα·cosβ+sinα·sinβ
3、sin(α±β)=sinα·cosβ±cosα·sinβ
4、4tan(α+β)=(tanα+tanβ)/(1-tanα·tanβ)
5、tan(α-β)=(tanα-tanβ)/(1+tanα·tanβ)
五、和差化积
1、sinθ+sinφ = 2 sin[(θ+φ)/2] cos[(θ-φ)/2]
2、sinθ-sinφ = 2 cos[(θ+φ)/2] sin[(θ-φ)/2]
3、cosθ+cosφ = 2 cos[(θ+φ)/2] cos[(θ-φ)/2]
4、cosθ-cosφ = -2 sin[(θ+φ)/2] sin[(θ-φ)/2]
5、tanA+tanB=sin(A+B)/cosAcosB=tan(A+B)(1-tanAtanB)
六、积化和差
1、sinαsinβ = [cos(α-β)-cos(α+β)] /2
2、sinαcosβ = [sin(α+β)+sin(α-β)]/2
3、cosαsinβ = [sin(α+β)-sin(α-β)]/2
七、诱导公式
1、(-α) = -sinα、cos(-α) = cosα
2、tan (—a)=-tanα、sin(π/2-α) = cosα、cos(π/2-α) = sinα、sin(π/2+α) = cosα
3、3cos(π/2+α) = -sinα
4、(π-α) = sinα、cos(π-α) = -cosα
5、5tanA= sinA/cosA、tan（π/2＋α）＝－cotα、tan（π/2－α）＝cotα
6、tan（π－α）＝－tanα、tan（π＋α）＝tanα
八、锐角三角函数公式
1、sin α=∠α的对边 / 斜边
2、α=∠α的邻边 / 斜边
3、tan α=∠α的对边 / ∠α的邻边
4、cot α=∠α的邻边 / ∠α的对边
绛旓細cos(蟺 + a) = - cos(a) 2.涓よ鍜屼笌宸殑涓夎鍑芥暟 sin(a + b) = sin(a)cos(b) + cos(伪)sin(b)cos(a + b) = cos(a)cos(b) - sin(a)sin(b) sin(a - b) = sin(a)cos(b) - cos(a)sin(b)cos(a - b) = cos(a)cos(b) + sin(a)sin(b) tan(a + ...
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绛旓細鍊嶈鍏紡鏄涓夎鍑芥暟涓潪甯稿疄鐢ㄧ殑涓绫诲叕寮.鐜板垪鍑哄叕寮忓涓:sin2伪=2sin伪cos伪 tan2伪=2tan伪/(1-tan^2(伪))cos2伪=cos^2(伪)-sin^2(伪)=2cos^2(伪)-1=1-2sin^2(伪)tan(伪/2)=sin伪/(1+cos伪)=(1-cos伪)/sin伪 tan(2伪)=2tan伪/[1-tan^2(伪)]涓夊嶈鍏紡锛歴in3伪=...
绛旓細鍏紡涓: 璁疚变负浠绘剰瑙,缁堣竟鐩稿悓鐨勮鐨勫悓涓涓夎鍑芥暟鐨勫肩浉绛: sin(2k蟺+伪)= sin伪 cos(2k蟺+伪)= cos伪 tan(2k蟺+伪)= tan伪 cot(2k蟺+伪)= cot伪 鍏紡浜: 璁疚变负浠绘剰瑙,蟺+伪鐨勪笁瑙掑嚱鏁板间笌伪鐨勪笁瑙掑嚱鏁板间箣闂寸殑鍏崇郴: sin(蟺+伪)= -sin伪 cos(蟺+伪)= -cos伪 tan(蟺+伪)= tan伪 ...
