精选优质文档-倾情为你奉上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) =tan(A-B) =cot(A+B) =cot(A-B) =倍角公式tan2A =sin2A = 2sinAcosAcos2A = cos2A-sin2A = 2cos2A-1 = 1-2sin2A三倍角公式sin3A = 3sinA-4(sinA)3cos3A = 4(cosA)3-3cosAtan3A = tanAtan(+A)tan(-A)半角公式sin=cos=tan=cot= tan=和差化积 sin a+sin b=2sincossin a-sin b = 2cossincos a+cos b = 2coscoscos a-cos b = -2sin
