特殊三角函数数值表-特殊三角函数值表图(共6页).doc

精选优质文档-倾情为你奉上两角和公式 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) sin3A = 3sinA-4(sinA)3; cos3A = 4(cosA)3 -3cosA tan3a = tan a tan(/3+a) tan(/3-a) 公式 sin(A/2) = (1-cosA)/2 cos(A/2) = (1+cosA)/2 tan(A/2) = (1-