高中全部函数公式大全三角函数公式两角和公式sin(A+B) = sinAcosB+cosAsinB sin(A-B) = sinAcosB-cosAsinB ? 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-tan2 A) Sin2A=2SinACosA Cos2A = Cos2 A-Sin2 A =2Cos2 A1 =12sin2 A 三倍角公式sin3A = 3sinA-4(sinA)3; cos3A = 4(cosA)3 -3cosA tan3a = tan a tan(/3+a) tan(/3-a) 半角公式 sin(A/2) = (1-cosA)/2 cos(A/2) = (1+cosA)/2 tan(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 sin(a)+sin(b) = 2sin(a+b)/2cos(a-b)/2 sin(a)-sin(b) = 2cos(a+b)/2sin(a-b)/2 cos(a)+cos(b) = 2cos(a+b)/2cos(a-b)/2 cos(a)-cos(b) = -2sin(a+b)/2sin(a-b)/2 tanA+tanB=sin(A+B)/cosAcosB 积化和差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) cos(a)sin(b) = 1/2*sin(a+b)-sin(a-b) 诱导公式sin(-a) = -sin(a) cos(-a) = cos(a) sin(/2-a) = cos(a) cos(/2-a) = sin(a) sin(/2+a) = cos(a) cos(/2+a) = -sin(a) sin(-a) = sin(a) cos(-a) = -cos(a) sin(+a) = -sin(a) cos(+a) = -cos(a) tgA=tanA = sinA/cosA 万能公式sin(a) = 2tan(a/2) / 1+tan(a/2)2 cos(a) = 1-tan(a/2)2 / 1+tan(a/2)2 tan(a) = 2tan(a/2)/1-tan(a/2)2 其它公式 asin(a)+bcos(a) = (a2+b2)*sin(a+c) 其中，tan(c)=b/a asin(a)-bcos(a) = (a2+b2)*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) 双曲函数 sinh(a) = ea-e(-a)/2 cosh(a) = ea+e(-a)/2 tg h(a) = sin h(a)/cos h(a)